166111531 has 8 divisors (see below), whose sum is σ = 168119600. Its totient is φ = 164112480.

The previous prime is 166111523. The next prime is 166111553. The reversal of 166111531 is 135111661.

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

It is a cyclic number.

It is not a de Polignac number, because 166111531 - 2³ = 166111523 is a prime.

It is a super-2 number, since 2×166111531² = 55186081462327922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166111496 and 166111505.

It is not an unprimeable number, because it can be changed into a prime (166111331) 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, 39301 + ... + 43321.

It is an arithmetic number, because the mean of its divisors is an integer number (21014950).

Almost surely, 2^166111531 is an apocalyptic number.

166111531 is a deficient number, since it is larger than the sum of its proper divisors (2008069).

166111531 is a wasteful number, since it uses less digits than its factorization.

166111531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4509.

The product of its digits is 540, while the sum is 25.

The square root of 166111531 is about 12888.4262421756. The cubic root of 166111531 is about 549.7095226472.

The spelling of 166111531 in words is "one hundred sixty-six million, one hundred eleven thousand, five hundred thirty-one".