16660401275664 has 60 divisors (see below), whose sum is σ = 46749007983600. Its totient is φ = 5538814126272.

The previous prime is 16660401275659. The next prime is 16660401275671. The reversal of 16660401275664 is 46657210406661.

It is a super-2 number, since 2×16660401275664² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16660401275664.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 152580294 + ... + 152689445.

It is an arithmetic number, because the mean of its divisors is an integer number (779150133060).

Almost surely, 2^{16660401275664} is an apocalyptic number.

It is an amenable number.

16660401275664 is an abundant number, since it is smaller than the sum of its proper divisors (30088606707936).

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

16660401275664 is a wasteful number, since it uses less digits than its factorization.

16660401275664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305270132 (or 305270123 counting only the distinct ones).

The product of its (nonzero) digits is 8709120, while the sum is 54.

The spelling of 16660401275664 in words is "sixteen trillion, six hundred sixty billion, four hundred one million, two hundred seventy-five thousand, six hundred sixty-four".