157557329681 has 2 divisors, whose sum is σ = 157557329682. Its totient is φ = 157557329680.

The previous prime is 157557329669. The next prime is 157557329693. The reversal of 157557329681 is 186923755751.

It is a balanced prime because it is at equal distance from previous prime (157557329669) and next prime (157557329693).

It can be written as a sum of positive squares in only one way, i.e., 156724141456 + 833188225 = 395884^2 + 28865^2 .

It is a cyclic number.

It is not a de Polignac number, because 157557329681 - 2³⁰ = 156483587857 is a prime.

It is a super-2 number, since 2×157557329681² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 157557329681.

It is not a weakly prime, because it can be changed into another prime (157557329381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78778664840 + 78778664841.

It is an arithmetic number, because the mean of its divisors is an integer number (78778664841).

Almost surely, 2^157557329681 is an apocalyptic number.

It is an amenable number.

157557329681 is a deficient number, since it is larger than the sum of its proper divisors (1).

157557329681 is an equidigital number, since it uses as much as digits as its factorization.

157557329681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15876000, while the sum is 59.

The spelling of 157557329681 in words is "one hundred fifty-seven billion, five hundred fifty-seven million, three hundred twenty-nine thousand, six hundred eighty-one".