166197274929 has 81 divisors (see below), whose sum is σ = 290386427097. Its totient is φ = 94837785336.

The previous prime is 166197274897. The next prime is 166197274931. The reversal of 166197274929 is 929472791661.

The square root of 166197274929 is 407673.

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

166197274929 is a `hidden beast` number, since 1 + 6 + 619 + 7 + 2 + 7 + 4 + 9 + 2 + 9 = 666.

It is a tau number, because it is divible by the number of its divisors (81).

It is not a de Polignac number, because 166197274929 - 2⁵ = 166197274897 is a prime.

It is a super-2 number, since 2×166197274929² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

Its product of digits (20575296) is a multiple of the sum of its prime divisors (729).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (166197274979) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 231150232 + ... + 231150950.

Almost surely, 2^166197274929 is an apocalyptic number.

166197274929 is the 407673-rd square number.

166197274929 is the 203837-th centered octagonal number.

It is an amenable number.

166197274929 is a deficient number, since it is larger than the sum of its proper divisors (124189152168).

166197274929 is an frugal number, since it uses more digits than its factorization.

166197274929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1476 (or 729 counting only the distinct ones).

The product of its digits is 20575296, while the sum is 63.

The spelling of 166197274929 in words is "one hundred sixty-six billion, one hundred ninety-seven million, two hundred seventy-four thousand, nine hundred twenty-nine".