166172788840 has 16 divisors (see below), whose sum is σ = 373888774980. Its totient is φ = 66469115520.

The previous prime is 166172788799. The next prime is 166172788871. The reversal of 166172788840 is 48887271661.

It can be written as a sum of positive squares in 2 ways, for example, as 155616048324 + 10556740516 = 394482^2 + 102746^2 .

It is a super-3 number, since 3×166172788840³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2077159821 + ... + 2077159900.

Almost surely, 2^166172788840 is an apocalyptic number.

166172788840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166172788840 is an abundant number, since it is smaller than the sum of its proper divisors (207715986140).

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

166172788840 is a wasteful number, since it uses less digits than its factorization.

166172788840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4154319732 (or 4154319728 counting only the distinct ones).

The product of its (nonzero) digits is 7225344, while the sum is 58.

The spelling of 166172788840 in words is "one hundred sixty-six billion, one hundred seventy-two million, seven hundred eighty-eight thousand, eight hundred forty".