561220444022165 has 16 divisors (see below), whose sum is σ = 673560571969008. Its totient is φ = 448912332550656.

The previous prime is 561220444022143. The next prime is 561220444022179.

It is a happy number.

561220444022165 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 8 ways, for example, as 2000533017604 + 559219911004561 = 1414402^2 + 23647831^2 .

It is a cyclic number.

It is not a de Polignac number, because 561220444022165 - 2²⁴ = 561220427244949 is a prime.

It is a super-2 number, since 2×561220444022165² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1446351119 + ... + 1446739091.

It is an arithmetic number, because the mean of its divisors is an integer number (42097535748063).

Almost surely, 2^{561220444022165} is an apocalyptic number.

It is an amenable number.

561220444022165 is a deficient number, since it is larger than the sum of its proper divisors (112340127946843).

561220444022165 is a wasteful number, since it uses less digits than its factorization.

561220444022165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428488.

The product of its (nonzero) digits is 921600, while the sum is 44.

The spelling of 561220444022165 in words is "five hundred sixty-one trillion, two hundred twenty billion, four hundred forty-four million, twenty-two thousand, one hundred sixty-five".