156556056116609 has 2 divisors, whose sum is σ = 156556056116610. Its totient is φ = 156556056116608.

The previous prime is 156556056116587. The next prime is 156556056116687. The reversal of 156556056116609 is 906611650655651.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 151813447987600 + 4742608129009 = 12321260^2 + 2177753^2 .

It is an emirp because it is prime and its reverse (906611650655651) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 156556056116609 - 2⁸ = 156556056116353 is a prime.

It is not a weakly prime, because it can be changed into another prime (156556056116699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78278028058304 + 78278028058305.

It is an arithmetic number, because the mean of its divisors is an integer number (78278028058305).

Almost surely, 2^{156556056116609} is an apocalyptic number.

It is an amenable number.

156556056116609 is a deficient number, since it is larger than the sum of its proper divisors (1).

156556056116609 is an equidigital number, since it uses as much as digits as its factorization.

156556056116609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43740000, while the sum is 62.

The spelling of 156556056116609 in words is "one hundred fifty-six trillion, five hundred fifty-six billion, fifty-six million, one hundred sixteen thousand, six hundred nine".