165131251312 has 40 divisors (see below), whose sum is σ = 329947274880. Its totient is φ = 80022989760.

The previous prime is 165131251301. The next prime is 165131251319. The reversal of 165131251312 is 213152131561.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165131251319) 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, 1164858 + ... + 1298905.

It is an arithmetic number, because the mean of its divisors is an integer number (8248681872).

Almost surely, 2^165131251312 is an apocalyptic number.

It is an amenable number.

165131251312 is a deficient number, since it is larger than the sum of its proper divisors (164816023568).

165131251312 is a wasteful number, since it uses less digits than its factorization.

165131251312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2463901 (or 2463895 counting only the distinct ones).

The product of its digits is 5400, while the sum is 31.

Adding to 165131251312 its reverse (213152131561), we get a palindrome (378283382873).

The spelling of 165131251312 in words is "one hundred sixty-five billion, one hundred thirty-one million, two hundred fifty-one thousand, three hundred twelve".