15649509604 has 9 divisors (see below), whose sum is σ = 27387079657. Its totient is φ = 7824629704.

The previous prime is 15649509587. The next prime is 15649509611. The reversal of 15649509604 is 40690594651.

The square root of 15649509604 is 125098.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 15600509604 + 49000000 = 124902^2 + 7000^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 218922 + ... + 281470.

Almost surely, 2^15649509604 is an apocalyptic number.

15649509604 is the 125098-th square number.

It is an amenable number.

15649509604 is a deficient number, since it is larger than the sum of its proper divisors (11737570053).

15649509604 is an frugal number, since it uses more digits than its factorization.

15649509604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125102 (or 62551 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 49.

Multiplying 15649509604 by its sum of digits (49), we get a square (766825970596 = 875686²).

The spelling of 15649509604 in words is "fifteen billion, six hundred forty-nine million, five hundred nine thousand, six hundred four".