13515515220 has 24 divisors (see below), whose sum is σ = 37843442784. Its totient is φ = 3604137376.

The previous prime is 13515515207. The next prime is 13515515227. The reversal of 13515515220 is 2251551531.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13515515227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 112629234 + ... + 112629353.

It is an arithmetic number, because the mean of its divisors is an integer number (1576810116).

Almost surely, 2^13515515220 is an apocalyptic number.

13515515220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13515515220 is an abundant number, since it is smaller than the sum of its proper divisors (24327927564).

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

13515515220 is a wasteful number, since it uses less digits than its factorization.

13515515220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225258599 (or 225258597 counting only the distinct ones).

The product of its (nonzero) digits is 7500, while the sum is 30.

The spelling of 13515515220 in words is "thirteen billion, five hundred fifteen million, five hundred fifteen thousand, two hundred twenty".