165506512510516 has 12 divisors (see below), whose sum is σ = 290713112125380. Its totient is φ = 82445623331840.

The previous prime is 165506512510513. The next prime is 165506512510649. The reversal of 165506512510516 is 615015215605561.

It can be written as a sum of positive squares in 2 ways, for example, as 66480051460900 + 99026461049616 = 8153530^2 + 9951204^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 165506512510516.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165506512510513) 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, 76908229645 + ... + 76908231796.

It is an arithmetic number, because the mean of its divisors is an integer number (24226092677115).

Almost surely, 2^{165506512510516} is an apocalyptic number.

It is an amenable number.

165506512510516 is a deficient number, since it is larger than the sum of its proper divisors (125206599614864).

165506512510516 is a wasteful number, since it uses less digits than its factorization.

165506512510516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153816461714 (or 153816461712 counting only the distinct ones).

The product of its (nonzero) digits is 1350000, while the sum is 49.

The spelling of 165506512510516 in words is "one hundred sixty-five trillion, five hundred six billion, five hundred twelve million, five hundred ten thousand, five hundred sixteen".