15638744648 has 32 divisors (see below), whose sum is σ = 30341757600. Its totient is φ = 7551696768.

The previous prime is 15638744617. The next prime is 15638744651. The reversal of 15638744648 is 84644783651.

It is a junction number, because it is equal to n+sod(n) for n = 15638744593 and 15638744602.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 224786 + ... + 286017.

It is an arithmetic number, because the mean of its divisors is an integer number (948179925).

Almost surely, 2^15638744648 is an apocalyptic number.

It is an amenable number.

15638744648 is a deficient number, since it is larger than the sum of its proper divisors (14703012952).

15638744648 is a wasteful number, since it uses less digits than its factorization.

15638744648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510941 (or 510937 counting only the distinct ones).

The product of its digits is 15482880, while the sum is 56.

The spelling of 15638744648 in words is "fifteen billion, six hundred thirty-eight million, seven hundred forty-four thousand, six hundred forty-eight".