166173630736 has 45 divisors (see below), whose sum is σ = 324120889701. Its totient is φ = 82533234816.

The previous prime is 166173630673. The next prime is 166173630737. The reversal of 166173630736 is 637036371661.

The square root of 166173630736 is 407644.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 143716810000 + 22456820736 = 379100^2 + 149856^2 .

It is a super-2 number, since 2×166173630736² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166173630736.

It is not an unprimeable number, because it can be changed into a prime (166173630737) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 363618220 + ... + 363618676.

Almost surely, 2^166173630736 is an apocalyptic number.

166173630736 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

166173630736 is the 407644-th square number.

It is an amenable number.

166173630736 is a deficient number, since it is larger than the sum of its proper divisors (157947258965).

166173630736 is an frugal number, since it uses more digits than its factorization.

166173630736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1368 (or 682 counting only the distinct ones).

The product of its (nonzero) digits is 1714608, while the sum is 49.

Multiplying 166173630736 by its sum of digits (49), we get a square (8142507906064 = 2853508²).

The spelling of 166173630736 in words is "one hundred sixty-six billion, one hundred seventy-three million, six hundred thirty thousand, seven hundred thirty-six".