16513402491 has 6 divisors (see below), whose sum is σ = 23852692500. Its totient is φ = 11008934988.

The previous prime is 16513402487. The next prime is 16513402501. The reversal of 16513402491 is 19420431561.

It is a happy number.

16513402491 is a `hidden beast` number, since 16 + 513 + 40 + 2 + 4 + 91 = 666.

It is not a de Polignac number, because 16513402491 - 2² = 16513402487 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16513402471) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 917411241 + ... + 917411258.

It is an arithmetic number, because the mean of its divisors is an integer number (3975448750).

Almost surely, 2^16513402491 is an apocalyptic number.

16513402491 is a deficient number, since it is larger than the sum of its proper divisors (7339290009).

16513402491 is a wasteful number, since it uses less digits than its factorization.

16513402491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1834822505 (or 1834822502 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The spelling of 16513402491 in words is "sixteen billion, five hundred thirteen million, four hundred two thousand, four hundred ninety-one".