16121524864 has 32 divisors (see below), whose sum is σ = 34006346100. Its totient is φ = 7586598912.

The previous prime is 16121524829. The next prime is 16121524889. The reversal of 16121524864 is 46842512161.

It can be written as a sum of positive squares in 2 ways, for example, as 14854734400 + 1266790464 = 121880^2 + 35592^2 .

It is a tau number, because it is divible by the number of its divisors (32).

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, 3702219 + ... + 3706570.

Almost surely, 2^16121524864 is an apocalyptic number.

It is an amenable number.

16121524864 is an abundant number, since it is smaller than the sum of its proper divisors (17884821236).

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

16121524864 is an equidigital number, since it uses as much as digits as its factorization.

16121524864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7408820 (or 7408808 counting only the distinct ones).

The product of its digits is 92160, while the sum is 40.

The spelling of 16121524864 in words is "sixteen billion, one hundred twenty-one million, five hundred twenty-four thousand, eight hundred sixty-four".