16681574784 has 64 divisors (see below), whose sum is σ = 50640503040. Its totient is φ = 4766163456.

The previous prime is 16681574759. The next prime is 16681574813. The reversal of 16681574784 is 48747518661.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3100284 + ... + 3105659.

It is an arithmetic number, because the mean of its divisors is an integer number (791257860).

Almost surely, 2^16681574784 is an apocalyptic number.

16681574784 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

16681574784 is an abundant number, since it is smaller than the sum of its proper divisors (33958928256).

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

16681574784 is an equidigital number, since it uses as much as digits as its factorization.

16681574784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6205967 (or 6205955 counting only the distinct ones).

The product of its digits is 9031680, while the sum is 57.

The spelling of 16681574784 in words is "sixteen billion, six hundred eighty-one million, five hundred seventy-four thousand, seven hundred eighty-four".