165555636512563 has 32 divisors (see below), whose sum is σ = 183156789284352. Its totient is φ = 148393245888000.

The previous prime is 165555636512521. The next prime is 165555636512573. The reversal of 165555636512563 is 365215636555561.

It is a cyclic number.

It is not a de Polignac number, because 165555636512563 - 2⁹ = 165555636512051 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 165555636512495 and 165555636512504.

It is not an unprimeable number, because it can be changed into a prime (165555636512503) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 384872481 + ... + 385302397.

It is an arithmetic number, because the mean of its divisors is an integer number (5723649665136).

Almost surely, 2^{165555636512563} is an apocalyptic number.

165555636512563 is a deficient number, since it is larger than the sum of its proper divisors (17601152771789).

165555636512563 is a wasteful number, since it uses less digits than its factorization.

165555636512563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431515.

The product of its digits is 364500000, while the sum is 64.

The spelling of 165555636512563 in words is "one hundred sixty-five trillion, five hundred fifty-five billion, six hundred thirty-six million, five hundred twelve thousand, five hundred sixty-three".