166535731 has 4 divisors (see below), whose sum is σ = 167282752. Its totient is φ = 165788712.

The previous prime is 166535729. The next prime is 166535749. The reversal of 166535731 is 137535661.

166535731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 166535731 - 2¹ = 166535729 is a prime.

It is a super-2 number, since 2×166535731² = 55468299399408722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166535531) 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, 373176 + ... + 373621.

It is an arithmetic number, because the mean of its divisors is an integer number (41820688).

Almost surely, 2^166535731 is an apocalyptic number.

166535731 is a deficient number, since it is larger than the sum of its proper divisors (747021).

166535731 is an equidigital number, since it uses as much as digits as its factorization.

166535731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 747020.

The product of its digits is 56700, while the sum is 37.

The square root of 166535731 is about 12904.8723744173. The cubic root of 166535731 is about 550.1770570449.

The spelling of 166535731 in words is "one hundred sixty-six million, five hundred thirty-five thousand, seven hundred thirty-one".