156764328636449 has 2 divisors, whose sum is σ = 156764328636450. Its totient is φ = 156764328636448.

The previous prime is 156764328636413. The next prime is 156764328636547. The reversal of 156764328636449 is 944636823467651.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127185795518224 + 29578533118225 = 11277668^2 + 5438615^2 .

It is a cyclic number.

It is not a de Polignac number, because 156764328636449 - 2²⁰ = 156764327587873 is a prime.

It is a super-2 number, since 2×156764328636449² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (156764328636049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78382164318224 + 78382164318225.

It is an arithmetic number, because the mean of its divisors is an integer number (78382164318225).

Almost surely, 2^{156764328636449} is an apocalyptic number.

It is an amenable number.

156764328636449 is a deficient number, since it is larger than the sum of its proper divisors (1).

156764328636449 is an equidigital number, since it uses as much as digits as its factorization.

156764328636449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3762339840, while the sum is 74.

The spelling of 156764328636449 in words is "one hundred fifty-six trillion, seven hundred sixty-four billion, three hundred twenty-eight million, six hundred thirty-six thousand, four hundred forty-nine".