13156633840 has 40 divisors (see below), whose sum is σ = 34959057120. Its totient is φ = 4510845696.

The previous prime is 13156633817. The next prime is 13156633843. The reversal of 13156633840 is 4833665131.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 13156633793 and 13156633802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13156633843) by changing a digit.

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, 11746435 + ... + 11747554.

It is an arithmetic number, because the mean of its divisors is an integer number (873976428).

Almost surely, 2^13156633840 is an apocalyptic number.

13156633840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13156633840 is an abundant number, since it is smaller than the sum of its proper divisors (21802423280).

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

13156633840 is a wasteful number, since it uses less digits than its factorization.

13156633840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23494009 (or 23494003 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 40.

The spelling of 13156633840 in words is "thirteen billion, one hundred fifty-six million, six hundred thirty-three thousand, eight hundred forty".