16612513521 has 16 divisors (see below), whose sum is σ = 22561848384. Its totient is φ = 10870288704.

The previous prime is 16612513513. The next prime is 16612513559. The reversal of 16612513521 is 12531521661.

It is not a de Polignac number, because 16612513521 - 2³ = 16612513513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16612513721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93510 + ... + 204863.

It is an arithmetic number, because the mean of its divisors is an integer number (1410115524).

Almost surely, 2^16612513521 is an apocalyptic number.

It is an amenable number.

16612513521 is a deficient number, since it is larger than the sum of its proper divisors (5949334863).

16612513521 is a wasteful number, since it uses less digits than its factorization.

16612513521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298720.

The product of its digits is 10800, while the sum is 33.

The spelling of 16612513521 in words is "sixteen billion, six hundred twelve million, five hundred thirteen thousand, five hundred twenty-one".