166061331 has 6 divisors (see below), whose sum is σ = 239866380. Its totient is φ = 110707548.

The previous prime is 166061267. The next prime is 166061339. The reversal of 166061331 is 133160661.

It is a happy number.

166061331 is a `hidden beast` number, since 16 + 6 + 0 + 613 + 31 = 666.

It is not a de Polignac number, because 166061331 - 2⁶ = 166061267 is a prime.

It is a super-2 number, since 2×166061331² = 55152731306983122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 166061295 and 166061304.

It is not an unprimeable number, because it can be changed into a prime (166061339) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9225621 + ... + 9225638.

It is an arithmetic number, because the mean of its divisors is an integer number (39977730).

Almost surely, 2^166061331 is an apocalyptic number.

166061331 is a deficient number, since it is larger than the sum of its proper divisors (73805049).

166061331 is a wasteful number, since it uses less digits than its factorization.

166061331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18451265 (or 18451262 counting only the distinct ones).

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

The square root of 166061331 is about 12886.4786113197. The cubic root of 166061331 is about 549.6541417871.

The spelling of 166061331 in words is "one hundred sixty-six million, sixty-one thousand, three hundred thirty-one".