165512312656 has 20 divisors (see below), whose sum is σ = 323622128500. Its totient is φ = 81996924672.

The previous prime is 165512312653. The next prime is 165512312659. The reversal of 165512312656 is 656213215561.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (165512312653) and next prime (165512312659).

It can be written as a sum of positive squares in 2 ways, for example, as 78064360000 + 87447952656 = 279400^2 + 295716^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165512312653) 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, 47450181 + ... + 47453668.

It is an arithmetic number, because the mean of its divisors is an integer number (16181106425).

Almost surely, 2^165512312656 is an apocalyptic number.

165512312656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

165512312656 is a deficient number, since it is larger than the sum of its proper divisors (158109815844).

165512312656 is a wasteful number, since it uses less digits than its factorization.

165512312656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94903966 (or 94903960 counting only the distinct ones).

The product of its digits is 324000, while the sum is 43.

The spelling of 165512312656 in words is "one hundred sixty-five billion, five hundred twelve million, three hundred twelve thousand, six hundred fifty-six".