15911648949 has 16 divisors (see below), whose sum is σ = 24302592000. Its totient is φ = 9071269680.

The previous prime is 15911648941. The next prime is 15911648999. The reversal of 15911648949 is 94984611951.

It is not a de Polignac number, because 15911648949 - 2³ = 15911648941 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15911648941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 869949 + ... + 888050.

It is an arithmetic number, because the mean of its divisors is an integer number (1518912000).

Almost surely, 2^15911648949 is an apocalyptic number.

It is an amenable number.

15911648949 is a deficient number, since it is larger than the sum of its proper divisors (8390943051).

15911648949 is a wasteful number, since it uses less digits than its factorization.

15911648949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1758440.

The product of its digits is 2799360, while the sum is 57.

The spelling of 15911648949 in words is "fifteen billion, nine hundred eleven million, six hundred forty-eight thousand, nine hundred forty-nine".