165731942257 has 8 divisors (see below), whose sum is σ = 199376772800. Its totient is φ = 134579321424.

The previous prime is 165731942203. The next prime is 165731942263. The reversal of 165731942257 is 752249137561.

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 165731942257 - 2³⁵ = 131372203889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165731943257) 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, 623052282 + ... + 623052547.

It is an arithmetic number, because the mean of its divisors is an integer number (24922096600).

Almost surely, 2^165731942257 is an apocalyptic number.

It is an amenable number.

165731942257 is a deficient number, since it is larger than the sum of its proper divisors (33644830543).

165731942257 is a wasteful number, since it uses less digits than its factorization.

165731942257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1246104855.

The product of its digits is 3175200, while the sum is 52.

The spelling of 165731942257 in words is "one hundred sixty-five billion, seven hundred thirty-one million, nine hundred forty-two thousand, two hundred fifty-seven".