165353353561 has 24 divisors (see below), whose sum is σ = 188069001120. Its totient is φ = 145175257920.

The previous prime is 165353353547. The next prime is 165353353661.

165353353561 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 165353353561 - 2²¹ = 165351256409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165353353541) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 284526 + ... + 641608.

It is an arithmetic number, because the mean of its divisors is an integer number (7836208380).

Almost surely, 2^165353353561 is an apocalyptic number.

165353353561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

165353353561 is a deficient number, since it is larger than the sum of its proper divisors (22715647559).

165353353561 is a wasteful number, since it uses less digits than its factorization.

165353353561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357237 (or 357226 counting only the distinct ones).

The product of its digits is 1822500, while the sum is 46.

The spelling of 165353353561 in words is "one hundred sixty-five billion, three hundred fifty-three million, three hundred fifty-three thousand, five hundred sixty-one".