13515421515 has 64 divisors (see below), whose sum is σ = 23244226560. Its totient is φ = 6681692160.

The previous prime is 13515421499. The next prime is 13515421561. The reversal of 13515421515 is 51512451531.

It is a happy number.

It is not a de Polignac number, because 13515421515 - 2⁴ = 13515421499 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 13637670 + ... + 13638660.

It is an arithmetic number, because the mean of its divisors is an integer number (363191040).

Almost surely, 2^13515421515 is an apocalyptic number.

13515421515 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

13515421515 is a deficient number, since it is larger than the sum of its proper divisors (9728805045).

13515421515 is a wasteful number, since it uses less digits than its factorization.

13515421515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1772.

The product of its digits is 15000, while the sum is 33.

The spelling of 13515421515 in words is "thirteen billion, five hundred fifteen million, four hundred twenty-one thousand, five hundred fifteen".