561637736165 has 32 divisors (see below), whose sum is σ = 749724049152. Its totient is φ = 400492800000.

The previous prime is 561637736089. The next prime is 561637736173.

561637736165 is nontrivially palindromic in base 10.

It is a de Polignac number, because none of the positive numbers 2^k-561637736165 is a prime.

It is a super-2 number, since 2×561637736165² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 561637736165.

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, 81365 + ... + 1062965.

It is an arithmetic number, because the mean of its divisors is an integer number (23428876536).

Almost surely, 2^561637736165 is an apocalyptic number.

561637736165 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

561637736165 is a deficient number, since it is larger than the sum of its proper divisors (188086312987).

561637736165 is a wasteful number, since it uses less digits than its factorization.

561637736165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 981821.

The product of its digits is 14288400, while the sum is 56.

The spelling of 561637736165 in words is "five hundred sixty-one billion, six hundred thirty-seven million, seven hundred thirty-six thousand, one hundred sixty-five".