155656631332991 has 2 divisors, whose sum is σ = 155656631332992. Its totient is φ = 155656631332990.

The previous prime is 155656631332897. The next prime is 155656631333003. The reversal of 155656631332991 is 199233136656551.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 155656631332991 - 2²⁶ = 155656564224127 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155656631532991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77828315666495 + 77828315666496.

It is an arithmetic number, because the mean of its divisors is an integer number (77828315666496).

Almost surely, 2^{155656631332991} is an apocalyptic number.

155656631332991 is a deficient number, since it is larger than the sum of its proper divisors (1).

155656631332991 is an equidigital number, since it uses as much as digits as its factorization.

155656631332991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 118098000, while the sum is 65.

The spelling of 155656631332991 in words is "one hundred fifty-five trillion, six hundred fifty-six billion, six hundred thirty-one million, three hundred thirty-two thousand, nine hundred ninety-one".