13125521540 has 12 divisors (see below), whose sum is σ = 27563595276. Its totient is φ = 5250208608.

The previous prime is 13125521533. The next prime is 13125521581. The reversal of 13125521540 is 4512552131.

It can be written as a sum of positive squares in 2 ways, for example, as 2893794436 + 10231727104 = 53794^2 + 101152^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 328138019 + ... + 328138058.

It is an arithmetic number, because the mean of its divisors is an integer number (2296966273).

Almost surely, 2^13125521540 is an apocalyptic number.

13125521540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13125521540 is an abundant number, since it is smaller than the sum of its proper divisors (14438073736).

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

13125521540 is a wasteful number, since it uses less digits than its factorization.

13125521540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 656276086 (or 656276084 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 29.

The spelling of 13125521540 in words is "thirteen billion, one hundred twenty-five million, five hundred twenty-one thousand, five hundred forty".