166541631 has 16 divisors (see below), whose sum is σ = 239447040. Its totient is φ = 102617280.

The previous prime is 166541629. The next prime is 166541659. The reversal of 166541631 is 136145661.

It is not a de Polignac number, because 166541631 - 2¹ = 166541629 is a prime.

It is a super-2 number, since 2×166541631² = 55472229712280322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 166541592 and 166541601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166541681) 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, 33295 + ... + 37968.

It is an arithmetic number, because the mean of its divisors is an integer number (14965440).

Almost surely, 2^166541631 is an apocalyptic number.

166541631 is a deficient number, since it is larger than the sum of its proper divisors (72905409).

166541631 is a wasteful number, since it uses less digits than its factorization.

166541631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71326.

The product of its digits is 12960, while the sum is 33.

The square root of 166541631 is about 12905.1009682218. The cubic root of 166541631 is about 550.1835541618.

The spelling of 166541631 in words is "one hundred sixty-six million, five hundred forty-one thousand, six hundred thirty-one".