13157621640 has 128 divisors (see below), whose sum is σ = 44204544000. Its totient is φ = 3481035264.

The previous prime is 13157621623. The next prime is 13157621651. The reversal of 13157621640 is 4612675131.

13157621640 is a `hidden beast` number, since 1 + 3 + 1 + 5 + 7 + 6 + 2 + 1 + 640 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 13157621595 and 13157621604.

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 31 ways as a sum of consecutive naturals, for example, 89196 + ... + 185124.

It is an arithmetic number, because the mean of its divisors is an integer number (345348000).

Almost surely, 2^13157621640 is an apocalyptic number.

13157621640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13157621640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22102272000).

13157621640 is an abundant number, since it is smaller than the sum of its proper divisors (31046922360).

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

13157621640 is a wasteful number, since it uses less digits than its factorization.

13157621640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96076 (or 96066 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The spelling of 13157621640 in words is "thirteen billion, one hundred fifty-seven million, six hundred twenty-one thousand, six hundred forty".