15813254640 has 80 divisors (see below), whose sum is σ = 51601161600. Its totient is φ = 3994926336.

The previous prime is 15813254627. The next prime is 15813254693. The reversal of 15813254640 is 4645231851.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1729350 + ... + 1738469.

It is an arithmetic number, because the mean of its divisors is an integer number (645014520).

Almost surely, 2^15813254640 is an apocalyptic number.

15813254640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15813254640 is an abundant number, since it is smaller than the sum of its proper divisors (35787906960).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15813254640 is a wasteful number, since it uses less digits than its factorization.

15813254640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3467854 (or 3467848 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 39.

The spelling of 15813254640 in words is "fifteen billion, eight hundred thirteen million, two hundred fifty-four thousand, six hundred forty".