166176945 has 48 divisors (see below), whose sum is σ = 330782400. Its totient is φ = 76325760.

The previous prime is 166176919. The next prime is 166176947. The reversal of 166176945 is 549671661.

It is not a de Polignac number, because 166176945 - 2¹⁶ = 166111409 is a prime.

It is a super-2 number, since 2×166176945² = 55229554099066050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 166176945.

It is not an unprimeable number, because it can be changed into a prime (166176947) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 571 + ... + 18239.

It is an arithmetic number, because the mean of its divisors is an integer number (6891300).

Almost surely, 2^166176945 is an apocalyptic number.

166176945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

166176945 is a deficient number, since it is larger than the sum of its proper divisors (164605455).

166176945 is a wasteful number, since it uses less digits than its factorization.

166176945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17710 (or 17707 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 166176945 is about 12890.9636955505. The cubic root of 166176945 is about 549.7816709189.

It can be divided in two parts, 1661 and 76945, that added together give a triangular number (78606 = T₃₉₆).

The spelling of 166176945 in words is "one hundred sixty-six million, one hundred seventy-six thousand, nine hundred forty-five".