1357770681 has 10 divisors (see below), whose sum is σ = 2028274842. Its totient is φ = 905180400.

The previous prime is 1357770649. The next prime is 1357770683. The reversal of 1357770681 is 1860777531.

1357770681 is a `hidden beast` number, since 1 + 3 + 577 + 70 + 6 + 8 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1311598656 + 46172025 = 36216^2 + 6795^2 .

It is not a de Polignac number, because 1357770681 - 2⁵ = 1357770649 is a prime.

It is a super-2 number, since 2×1357770681² = 3687082444366407522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1357770683) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 8381220 + ... + 8381381.

Almost surely, 2^1357770681 is an apocalyptic number.

It is an amenable number.

1357770681 is a deficient number, since it is larger than the sum of its proper divisors (670504161).

1357770681 is an equidigital number, since it uses as much as digits as its factorization.

1357770681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16762613 (or 16762604 counting only the distinct ones).

The product of its (nonzero) digits is 246960, while the sum is 45.

The square root of 1357770681 is about 36847.9399831252. The cubic root of 1357770681 is about 1107.3259445158.

The spelling of 1357770681 in words is "one billion, three hundred fifty-seven million, seven hundred seventy thousand, six hundred eighty-one".