155995277891 has 4 divisors (see below), whose sum is σ = 156065014272. Its totient is φ = 155925541512.

The previous prime is 155995277863. The next prime is 155995277969. The reversal of 155995277891 is 198772599551.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 155995277891 - 2⁶ = 155995277827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155995277861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34864835 + ... + 34869308.

It is an arithmetic number, because the mean of its divisors is an integer number (39016253568).

Almost surely, 2^155995277891 is an apocalyptic number.

155995277891 is a deficient number, since it is larger than the sum of its proper divisors (69736381).

155995277891 is an equidigital number, since it uses as much as digits as its factorization.

155995277891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69736380.

The product of its digits is 71442000, while the sum is 68.

The spelling of 155995277891 in words is "one hundred fifty-five billion, nine hundred ninety-five million, two hundred seventy-seven thousand, eight hundred ninety-one".