155856775369 has 3 divisors (see below), whose sum is σ = 155857170157. Its totient is φ = 155856380582.

The previous prime is 155856775337. The next prime is 155856775441. The reversal of 155856775369 is 963577658551.

The square root of 155856775369 is 394787.

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 is not a de Polignac number, because 155856775369 - 2⁵ = 155856775337 is a prime.

It is a super-2 number, since 2×155856775369² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155856775469) 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, 197394 + ... + 592180.

Almost surely, 2^155856775369 is an apocalyptic number.

155856775369 is the 394787-th square number.

155856775369 is the 197394-th centered octagonal number.

It is an amenable number.

155856775369 is a deficient number, since it is larger than the sum of its proper divisors (394788).

155856775369 is an frugal number, since it uses more digits than its factorization.

155856775369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 789574 (or 394787 counting only the distinct ones).

The product of its digits is 238140000, while the sum is 67.

It can be divided in two parts, 155856 and 775369, that added together give a square (931225 = 965²).

The spelling of 155856775369 in words is "one hundred fifty-five billion, eight hundred fifty-six million, seven hundred seventy-five thousand, three hundred sixty-nine".