16660631564400 has 120 divisors (see below), whose sum is σ = 53379861528240. Its totient is φ = 4441977221120.

The previous prime is 16660631564347. The next prime is 16660631564419. The reversal of 16660631564400 is 446513606661.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 16660631564400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4888984 + ... + 7564616.

It is an arithmetic number, because the mean of its divisors is an integer number (444832179402).

Almost surely, 2^{16660631564400} is an apocalyptic number.

16660631564400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16660631564400 is an abundant number, since it is smaller than the sum of its proper divisors (36719229963840).

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

16660631564400 is a wasteful number, since it uses less digits than its factorization.

16660631564400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2680843 (or 2680832 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 48.

The spelling of 16660631564400 in words is "sixteen trillion, six hundred sixty billion, six hundred thirty-one million, five hundred sixty-four thousand, four hundred".