165552565255561 has 24 divisors (see below), whose sum is σ = 191762812043712. Its totient is φ = 142533417972000.

The previous prime is 165552565255453. The next prime is 165552565255621.

165552565255561 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 165552565255561 - 2⁷ = 165552565255433 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 165552565255493 and 165552565255502.

It is not an unprimeable number, because it can be changed into a prime (165552565255361) 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, 294209451 + ... + 294771616.

It is an arithmetic number, because the mean of its divisors is an integer number (7990117168488).

Almost surely, 2^{165552565255561} is an apocalyptic number.

165552565255561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

165552565255561 is a deficient number, since it is larger than the sum of its proper divisors (26210246788151).

165552565255561 is a wasteful number, since it uses less digits than its factorization.

165552565255561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 588981213 (or 588981202 counting only the distinct ones).

The product of its digits is 337500000, while the sum is 64.

The spelling of 165552565255561 in words is "one hundred sixty-five trillion, five hundred fifty-two billion, five hundred sixty-five million, two hundred fifty-five thousand, five hundred sixty-one".