166163321 has 16 divisors (see below), whose sum is σ = 180278784. Its totient is φ = 152565504.

The previous prime is 166163311. The next prime is 166163323. The reversal of 166163321 is 123361661.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 166163321 - 2²⁶ = 99054457 is a prime.

It is a super-2 number, since 2×166163321² = 55220498491498082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166163323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 200510 + ... + 201336.

It is an arithmetic number, because the mean of its divisors is an integer number (11267424).

Almost surely, 2^166163321 is an apocalyptic number.

It is an amenable number.

166163321 is a deficient number, since it is larger than the sum of its proper divisors (14115463).

166163321 is a wasteful number, since it uses less digits than its factorization.

166163321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1120.

The product of its digits is 3888, while the sum is 29.

The square root of 166163321 is about 12890.4352525429. The cubic root of 166163321 is about 549.7666459101.

The spelling of 166163321 in words is "one hundred sixty-six million, one hundred sixty-three thousand, three hundred twenty-one".