166133731 has 4 divisors (see below), whose sum is σ = 166561200. Its totient is φ = 165706264.

The previous prime is 166133729. The next prime is 166133753. The reversal of 166133731 is 137331661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 166133731 - 2¹ = 166133729 is a prime.

It is a super-2 number, since 2×166133731² = 55200833151960722, 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 = 166133693 and 166133702.

It is not an unprimeable number, because it can be changed into a prime (166133711) 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, 213151 + ... + 213928.

It is an arithmetic number, because the mean of its divisors is an integer number (41640300).

Almost surely, 2^166133731 is an apocalyptic number.

166133731 is a deficient number, since it is larger than the sum of its proper divisors (427469).

166133731 is an equidigital number, since it uses as much as digits as its factorization.

166133731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427468.

The product of its digits is 6804, while the sum is 31.

The square root of 166133731 is about 12889.2874512131. The cubic root of 166133731 is about 549.7340102263.

The spelling of 166133731 in words is "one hundred sixty-six million, one hundred thirty-three thousand, seven hundred thirty-one".