13057043994 has 20 divisors (see below), whose sum is σ = 29257450794. Its totient is φ = 4352347944.

The previous prime is 13057043981. The next prime is 13057043999. The reversal of 13057043994 is 49934075031.

13057043994 is a `hidden beast` number, since 1 + 30 + 570 + 43 + 9 + 9 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 9877775769 + 3179268225 = 99387^2 + 56385^2 .

It is a super-2 number, since 2×13057043994² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13057043999) 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, 40299357 + ... + 40299680.

Almost surely, 2^13057043994 is an apocalyptic number.

13057043994 is an abundant number, since it is smaller than the sum of its proper divisors (16200406800).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13057043994 is an equidigital number, since it uses as much as digits as its factorization.

13057043994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80599051 (or 80599042 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 45.

The spelling of 13057043994 in words is "thirteen billion, fifty-seven million, forty-three thousand, nine hundred ninety-four".