13106561620 has 24 divisors (see below), whose sum is σ = 27900820584. Its totient is φ = 5170807296.

The previous prime is 13106561617. The next prime is 13106561669. The reversal of 13106561620 is 2616560131.

It can be written as a sum of positive squares in 4 ways, for example, as 9132484 + 13097429136 = 3022^2 + 114444^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4487089 + ... + 4490008.

It is an arithmetic number, because the mean of its divisors is an integer number (1162534191).

Almost surely, 2^13106561620 is an apocalyptic number.

13106561620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13106561620 is an abundant number, since it is smaller than the sum of its proper divisors (14794258964).

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

13106561620 is a wasteful number, since it uses less digits than its factorization.

13106561620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8977179 (or 8977177 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 31.

The spelling of 13106561620 in words is "thirteen billion, one hundred six million, five hundred sixty-one thousand, six hundred twenty".