157775316151681 has 2 divisors, whose sum is σ = 157775316151682. Its totient is φ = 157775316151680.

The previous prime is 157775316151679. The next prime is 157775316151759. The reversal of 157775316151681 is 186151613577751.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 157703137956081 + 72178195600 = 12557991^2 + 268660^2 .

It is a cyclic number.

It is not a de Polignac number, because 157775316151681 - 2¹ = 157775316151679 is a prime.

It is a super-2 number, since 2×157775316151681² (a number of 29 digits) contains 22 as substring.

Together with 157775316151679, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (157775316161681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78887658075840 + 78887658075841.

It is an arithmetic number, because the mean of its divisors is an integer number (78887658075841).

Almost surely, 2^{157775316151681} is an apocalyptic number.

It is an amenable number.

157775316151681 is a deficient number, since it is larger than the sum of its proper divisors (1).

157775316151681 is an equidigital number, since it uses as much as digits as its factorization.

157775316151681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37044000, while the sum is 64.

The spelling of 157775316151681 in words is "one hundred fifty-seven trillion, seven hundred seventy-five billion, three hundred sixteen million, one hundred fifty-one thousand, six hundred eighty-one".