166345431 has 8 divisors (see below), whose sum is σ = 253478784. Its totient is φ = 95054520.

The previous prime is 166345427. The next prime is 166345447. The reversal of 166345431 is 134543661.

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

It is not a de Polignac number, because 166345431 - 2² = 166345427 is a prime.

It is a super-2 number, since 2×166345431² = 55341604829151522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 166345392 and 166345401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166345631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3960585 + ... + 3960626.

It is an arithmetic number, because the mean of its divisors is an integer number (31684848).

Almost surely, 2^166345431 is an apocalyptic number.

166345431 is a deficient number, since it is larger than the sum of its proper divisors (87133353).

166345431 is an equidigital number, since it uses as much as digits as its factorization.

166345431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7921221.

The product of its digits is 25920, while the sum is 33.

The square root of 166345431 is about 12897.4970827676. The cubic root of 166345431 is about 549.9674151494.

The spelling of 166345431 in words is "one hundred sixty-six million, three hundred forty-five thousand, four hundred thirty-one".