16661600564 has 24 divisors (see below), whose sum is σ = 33490665600. Its totient is φ = 7104800736.

The previous prime is 16661600561. The next prime is 16661600581. The reversal of 16661600564 is 46500616661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16661600561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1489547 + ... + 1500690.

It is an arithmetic number, because the mean of its divisors is an integer number (1395444400).

Almost surely, 2^16661600564 is an apocalyptic number.

16661600564 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

16661600564 is an abundant number, since it is smaller than the sum of its proper divisors (16829065036).

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

16661600564 is a wasteful number, since it uses less digits than its factorization.

16661600564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2990447 (or 2990445 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 41.

The spelling of 16661600564 in words is "sixteen billion, six hundred sixty-one million, six hundred thousand, five hundred sixty-four".