11815257216 has 64 divisors (see below), whose sum is σ = 35867753280. Its totient is φ = 3375787008.

The previous prime is 11815257191. The next prime is 11815257239. The reversal of 11815257216 is 61275251811.

It is a tau number, because it is divible by the number of its divisors (64).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2195091 + ... + 2200466.

It is an arithmetic number, because the mean of its divisors is an integer number (560433645).

Almost surely, 2^11815257216 is an apocalyptic number.

11815257216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

11815257216 is an abundant number, since it is smaller than the sum of its proper divisors (24052496064).

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

11815257216 is an equidigital number, since it uses as much as digits as its factorization.

11815257216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4395581 (or 4395569 counting only the distinct ones).

The product of its digits is 33600, while the sum is 39.

The spelling of 11815257216 in words is "eleven billion, eight hundred fifteen million, two hundred fifty-seven thousand, two hundred sixteen".