15516253651 has 30 divisors (see below), whose sum is σ = 17783926700. Its totient is φ = 13497488640.

The previous prime is 15516253639. The next prime is 15516253657. The reversal of 15516253651 is 15635261551.

It is a happy number.

It is not a de Polignac number, because 15516253651 - 2⁵ = 15516253619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15516253657) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 378445191 + ... + 378445231.

Almost surely, 2^15516253651 is an apocalyptic number.

15516253651 is a deficient number, since it is larger than the sum of its proper divisors (2267673049).

15516253651 is an frugal number, since it uses more digits than its factorization.

15516253651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217 (or 77 counting only the distinct ones).

The product of its digits is 135000, while the sum is 40.

The spelling of 15516253651 in words is "fifteen billion, five hundred sixteen million, two hundred fifty-three thousand, six hundred fifty-one".