155974272977 has 2 divisors, whose sum is σ = 155974272978. Its totient is φ = 155974272976.

The previous prime is 155974272943. The next prime is 155974273031. The reversal of 155974272977 is 779272479551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 117734079376 + 38240193601 = 343124^2 + 195551^2 .

It is a cyclic number.

It is not a de Polignac number, because 155974272977 - 2⁶ = 155974272913 is a prime.

It is not a weakly prime, because it can be changed into another prime (155974272917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77987136488 + 77987136489.

It is an arithmetic number, because the mean of its divisors is an integer number (77987136489).

Almost surely, 2^155974272977 is an apocalyptic number.

It is an amenable number.

155974272977 is a deficient number, since it is larger than the sum of its proper divisors (1).

155974272977 is an equidigital number, since it uses as much as digits as its factorization.

155974272977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77792400, while the sum is 65.

The spelling of 155974272977 in words is "one hundred fifty-five billion, nine hundred seventy-four million, two hundred seventy-two thousand, nine hundred seventy-seven".