165733731 has 24 divisors (see below), whose sum is σ = 255331440. Its totient is φ = 103228416.

The previous prime is 165733721. The next prime is 165733741. The reversal of 165733731 is 137337561.

It is a happy number.

165733731 is a `hidden beast` number, since 16 + 573 + 3 + 73 + 1 = 666.

165733731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (165733721) and next prime (165733741).

It is a de Polignac number, because none of the positive numbers 2^k-165733731 is a prime.

It is a super-2 number, since 2×165733731² = 54935339182360722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (165733721) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17371 + ... + 25163.

It is an arithmetic number, because the mean of its divisors is an integer number (10638810).

Almost surely, 2^165733731 is an apocalyptic number.

165733731 is a deficient number, since it is larger than the sum of its proper divisors (89597709).

165733731 is a wasteful number, since it uses less digits than its factorization.

165733731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7955 (or 7952 counting only the distinct ones).

The product of its digits is 39690, while the sum is 36.

The square root of 165733731 is about 12873.7613384745. The cubic root of 165733731 is about 549.2924576723.

It can be divided in two parts, 165733 and 731, that added together give a square (166464 = 408²).

The spelling of 165733731 in words is "one hundred sixty-five million, seven hundred thirty-three thousand, seven hundred thirty-one".