561557755164 has 48 divisors (see below), whose sum is σ = 1500225106688. Its totient is φ = 160151741568.

The previous prime is 561557755163. The next prime is 561557755217. The reversal of 561557755164 is 461557755165.

It is a happy number.

It is a super-2 number, since 2×561557755164² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561557755163) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6064849 + ... + 6156744.

Almost surely, 2^561557755164 is an apocalyptic number.

It is an amenable number.

561557755164 is an abundant number, since it is smaller than the sum of its proper divisors (938667351524).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

561557755164 is a wasteful number, since it uses less digits than its factorization.

561557755164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12222154 (or 12222152 counting only the distinct ones).

The product of its digits is 22050000, while the sum is 57.

Subtracting from 561557755164 its reverse (461557755165), we obtain a palindrome (99999999999).

The spelling of 561557755164 in words is "five hundred sixty-one billion, five hundred fifty-seven million, seven hundred fifty-five thousand, one hundred sixty-four".