166031361 has 6 divisors (see below), whose sum is σ = 239823090. Its totient is φ = 110687568.

The previous prime is 166031357. The next prime is 166031363. The reversal of 166031361 is 163130661.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 96825600 + 69205761 = 9840^2 + 8319^2 .

It is not a de Polignac number, because 166031361 - 2² = 166031357 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166031363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9223956 + ... + 9223973.

It is an arithmetic number, because the mean of its divisors is an integer number (39970515).

Almost surely, 2^166031361 is an apocalyptic number.

It is an amenable number.

166031361 is a deficient number, since it is larger than the sum of its proper divisors (73791729).

166031361 is a wasteful number, since it uses less digits than its factorization.

166031361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18447935 (or 18447932 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 166031361 is about 12885.3157120809. The cubic root of 166031361 is about 549.6210734310.

The spelling of 166031361 in words is "one hundred sixty-six million, thirty-one thousand, three hundred sixty-one".