12515515290 has 48 divisors (see below), whose sum is σ = 33419817288. Its totient is φ = 3247267968.

The previous prime is 12515515283. The next prime is 12515515291. The reversal of 12515515290 is 9251551521.

It is a happy number.

12515515290 is a `hidden beast` number, since 1 + 2 + 51 + 5 + 515 + 2 + 90 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 10547084601 + 1968430689 = 102699^2 + 44367^2 .

It is not an unprimeable number, because it can be changed into a prime (12515515291) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1875877 + ... + 1882536.

Almost surely, 2^12515515290 is an apocalyptic number.

12515515290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12515515290 is an abundant number, since it is smaller than the sum of its proper divisors (20904301998).

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

12515515290 is a wasteful number, since it uses less digits than its factorization.

12515515290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3758463 (or 3758460 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 36.

The spelling of 12515515290 in words is "twelve billion, five hundred fifteen million, five hundred fifteen thousand, two hundred ninety".