155877304969 has 3 divisors (see below), whose sum is σ = 155877699783. Its totient is φ = 155876910156.

The previous prime is 155877304963. The next prime is 155877304987. The reversal of 155877304969 is 969403778551.

The square root of 155877304969 is 394813.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 127252725625 + 28624579344 = 356725^2 + 169188^2 .

It is not a de Polignac number, because 155877304969 - 2²⁹ = 155340434057 is a prime.

It is a super-2 number, since 2×155877304969² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 155877304969.

It is not an unprimeable number, because it can be changed into a prime (155877304963) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 197407 + ... + 592219.

It is an arithmetic number, because the mean of its divisors is an integer number (51959233261).

Almost surely, 2^155877304969 is an apocalyptic number.

155877304969 is the 394813-rd square number.

155877304969 is the 197407-th centered octagonal number.

It is an amenable number.

155877304969 is a deficient number, since it is larger than the sum of its proper divisors (394814).

155877304969 is an frugal number, since it uses more digits than its factorization.

155877304969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 789626 (or 394813 counting only the distinct ones).

The product of its (nonzero) digits is 57153600, while the sum is 64.

Multiplying 155877304969 by its sum of digits (64), we get a square (9976147518016 = 3158504²).

The spelling of 155877304969 in words is "one hundred fifty-five billion, eight hundred seventy-seven million, three hundred four thousand, nine hundred sixty-nine".