561751666157165 has 32 divisors (see below), whose sum is σ = 742160395130112. Its totient is φ = 408161603044800.

The previous prime is 561751666157147. The next prime is 561751666157203.

561751666157165 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 561751666157165 - 2²⁰ = 561751665108589 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 561751666157095 and 561751666157104.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32717777 + ... + 46839686.

It is an arithmetic number, because the mean of its divisors is an integer number (23192512347816).

Almost surely, 2^{561751666157165} is an apocalyptic number.

561751666157165 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

561751666157165 is a deficient number, since it is larger than the sum of its proper divisors (180408728972947).

561751666157165 is a wasteful number, since it uses less digits than its factorization.

561751666157165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79558562 (or 79558540 counting only the distinct ones).

The product of its digits is 238140000, while the sum is 68.

The spelling of 561751666157165 in words is "five hundred sixty-one trillion, seven hundred fifty-one billion, six hundred sixty-six million, one hundred fifty-seven thousand, one hundred sixty-five".