166595131 has 4 divisors (see below), whose sum is σ = 166622512. Its totient is φ = 166567752.

The previous prime is 166595113. The next prime is 166595137. The reversal of 166595131 is 131595661.

166595131 is a nontrivial binomial coefficient, being equal to C(18254, 2).

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 131595661 = 53 ⋅2482937.

It is a 3-Lehmer number, since φ(166595131) divides (166595131-1)³.

It is a cyclic number.

It is not a de Polignac number, because 166595131 - 2¹³ = 166586939 is a prime.

It is a super-2 number, since 2×166595131² = 55507875345814322, which contains 22 as substring.

It is a deceptive number, since it divides R_166595130.

It is not an unprimeable number, because it can be changed into a prime (166595137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1 + ... + 18253.

It is an arithmetic number, because the mean of its divisors is an integer number (41655628).

Almost surely, 2^166595131 is an apocalyptic number.

166595131 is the 18253-rd triangular number and also the 9127-th hexagonal number.

166595131 is the 6085-th centered nonagonal number.

166595131 is a deficient number, since it is larger than the sum of its proper divisors (27381).

166595131 is an equidigital number, since it uses as much as digits as its factorization.

166595131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27380.

The product of its digits is 24300, while the sum is 37.

The square root of 166595131 is about 12907.1736255464. The cubic root of 166595131 is about 550.2424616927.

The spelling of 166595131 in words is "one hundred sixty-six million, five hundred ninety-five thousand, one hundred thirty-one".