16661716685200 has 30 divisors (see below), whose sum is σ = 40029774337154. Its totient is φ = 6664686673920.

The previous prime is 16661716685197. The next prime is 16661716685203. The reversal of 16661716685200 is 258661716661.

16661716685200 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (16661716685197) and next prime (16661716685203).

It can be written as a sum of positive squares in 3 ways, for example, as 4051235021824 + 12610481663376 = 2012768^2 + 3551124^2 .

It is a super-2 number, since 2×16661716685200² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16661716685203) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 20827145457 + ... + 20827146256.

Almost surely, 2^{16661716685200} is an apocalyptic number.

16661716685200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16661716685200 is an abundant number, since it is smaller than the sum of its proper divisors (23368057651954).

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

16661716685200 is a wasteful number, since it uses less digits than its factorization.

16661716685200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41654291731 (or 41654291720 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 55.

The spelling of 16661716685200 in words is "sixteen trillion, six hundred sixty-one billion, seven hundred sixteen million, six hundred eighty-five thousand, two hundred".