1157660681 has 2 divisors, whose sum is σ = 1157660682. Its totient is φ = 1157660680.

The previous prime is 1157660659. The next prime is 1157660701. The reversal of 1157660681 is 1860667511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1112556025 + 45104656 = 33355^2 + 6716^2 .

It is a cyclic number.

It is not a de Polignac number, because 1157660681 - 2⁶ = 1157660617 is a prime.

It is a super-2 number, since 2×1157660681² = 2680356504666767522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1157660641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 578830340 + 578830341.

It is an arithmetic number, because the mean of its divisors is an integer number (578830341).

Almost surely, 2^1157660681 is an apocalyptic number.

It is an amenable number.

1157660681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1157660681 is an equidigital number, since it uses as much as digits as its factorization.

1157660681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 41.

The square root of 1157660681 is about 34024.4130147751. The cubic root of 1157660681 is about 1050.0107877954.

The spelling of 1157660681 in words is "one billion, one hundred fifty-seven million, six hundred sixty thousand, six hundred eighty-one".