2357857681 has 2 divisors, whose sum is σ = 2357857682. Its totient is φ = 2357857680.

The previous prime is 2357857637. The next prime is 2357857703. The reversal of 2357857681 is 1867587532.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2070250000 + 287607681 = 45500^2 + 16959^2 .

It is a cyclic number.

It is not a de Polignac number, because 2357857681 - 2⁷ = 2357857553 is a prime.

It is a super-2 number, since 2×2357857681² = 11118985687701395522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2357857081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1178928840 + 1178928841.

It is an arithmetic number, because the mean of its divisors is an integer number (1178928841).

Almost surely, 2^2357857681 is an apocalyptic number.

It is an amenable number.

2357857681 is a deficient number, since it is larger than the sum of its proper divisors (1).

2357857681 is an equidigital number, since it uses as much as digits as its factorization.

2357857681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2822400, while the sum is 52.

The square root of 2357857681 is about 48557.7767304064. The cubic root of 2357857681 is about 1330.9830636850.

The spelling of 2357857681 in words is "two billion, three hundred fifty-seven million, eight hundred fifty-seven thousand, six hundred eighty-one".