166961931 has 8 divisors (see below), whose sum is σ = 222675600. Its totient is φ = 111278112.

The previous prime is 166961909. The next prime is 166961933. The reversal of 166961931 is 139169661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 166961931 - 2⁷ = 166961803 is a prime.

It is a super-2 number, since 2×166961931² = 55752572806497522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (166961933) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18261 + ... + 25833.

It is an arithmetic number, because the mean of its divisors is an integer number (27834450).

Almost surely, 2^166961931 is an apocalyptic number.

166961931 is a deficient number, since it is larger than the sum of its proper divisors (55713669).

166961931 is an equidigital number, since it uses as much as digits as its factorization.

166961931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14925.

The product of its digits is 52488, while the sum is 42.

The square root of 166961931 is about 12921.3749655368. The cubic root of 166961931 is about 550.6459968768.

The spelling of 166961931 in words is "one hundred sixty-six million, nine hundred sixty-one thousand, nine hundred thirty-one".