166172317776 has 50 divisors (see below), whose sum is σ = 480950901882. Its totient is φ = 55390772160.

The previous prime is 166172317679. The next prime is 166172317789. The reversal of 166172317776 is 677713271661.

It is a happy number.

166172317776 is a `hidden beast` number, since 1 + 6 + 617 + 2 + 3 + 17 + 7 + 7 + 6 = 666.

166172317776 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 118421327376 + 47750990400 = 344124^2 + 218520^2 .

It is a super-2 number, since 2×166172317776² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 64108395 + ... + 64110986.

Almost surely, 2^166172317776 is an apocalyptic number.

166172317776 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

166172317776 is an abundant number, since it is smaller than the sum of its proper divisors (314778584106).

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

166172317776 is a wasteful number, since it uses less digits than its factorization.

166172317776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128219401 (or 128219386 counting only the distinct ones).

The product of its digits is 3111696, while the sum is 54.

The spelling of 166172317776 in words is "one hundred sixty-six billion, one hundred seventy-two million, three hundred seventeen thousand, seven hundred seventy-six".