16866853370172 has 72 divisors (see below), whose sum is σ = 45916177638240. Its totient is φ = 5189704444800.

The previous prime is 16866853370167. The next prime is 16866853370177. The reversal of 16866853370172 is 27107335866861.

It is a happy number.

16866853370172 is a `hidden beast` number, since 1 + 6 + 86 + 6 + 8 + 533 + 7 + 0 + 17 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (16866853370167) and next prime (16866853370177).

It is a super-2 number, since 2×16866853370172² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16866853370177) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27259729 + ... + 27871607.

It is an arithmetic number, because the mean of its divisors is an integer number (637724689420).

Almost surely, 2^{16866853370172} is an apocalyptic number.

16866853370172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

16866853370172 is an abundant number, since it is smaller than the sum of its proper divisors (29049324268068).

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

16866853370172 is a wasteful number, since it uses less digits than its factorization.

16866853370172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670803 (or 670798 counting only the distinct ones).

The product of its (nonzero) digits is 60963840, while the sum is 63.

The spelling of 16866853370172 in words is "sixteen trillion, eight hundred sixty-six billion, eight hundred fifty-three million, three hundred seventy thousand, one hundred seventy-two".