16679513521 has 16 divisors (see below), whose sum is σ = 18780468480. Its totient is φ = 14683672080.

The previous prime is 16679513519. The next prime is 16679513533. The reversal of 16679513521 is 12531597661.

It is not a de Polignac number, because 16679513521 - 2¹ = 16679513519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16679513321) 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, 148311 + ... + 235276.

It is an arithmetic number, because the mean of its divisors is an integer number (1173779280).

Almost surely, 2^16679513521 is an apocalyptic number.

16679513521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16679513521 is a deficient number, since it is larger than the sum of its proper divisors (2100954959).

16679513521 is a wasteful number, since it uses less digits than its factorization.

16679513521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383724.

The product of its digits is 340200, while the sum is 46.

The spelling of 16679513521 in words is "sixteen billion, six hundred seventy-nine million, five hundred thirteen thousand, five hundred twenty-one".