165655042553 has 32 divisors (see below), whose sum is σ = 222764731392. Its totient is φ = 118966708800.

The previous prime is 165655042549. The next prime is 165655042561. The reversal of 165655042553 is 355240556561.

It is a cyclic number.

It is not a de Polignac number, because 165655042553 - 2² = 165655042549 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 165655042498 and 165655042507.

It is not an unprimeable number, because it can be changed into a prime (165655042513) 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, 514958 + ... + 772328.

It is an arithmetic number, because the mean of its divisors is an integer number (6961397856).

Almost surely, 2^165655042553 is an apocalyptic number.

165655042553 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

165655042553 is a deficient number, since it is larger than the sum of its proper divisors (57109688839).

165655042553 is a wasteful number, since it uses less digits than its factorization.

165655042553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258045.

The product of its (nonzero) digits is 2700000, while the sum is 47.

The spelling of 165655042553 in words is "one hundred sixty-five billion, six hundred fifty-five million, forty-two thousand, five hundred fifty-three".