43561648564 has 18 divisors (see below), whose sum is σ = 88679070690. Its totient is φ = 18669277872.

The previous prime is 43561648549. The next prime is 43561648573. The reversal of 43561648564 is 46584616534.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 41762192164 + 1799456400 = 204358^2 + 42420^2 .

It is a super-2 number, since 2×43561648564² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 111126459 + ... + 111126850.

Almost surely, 2^43561648564 is an apocalyptic number.

It is an amenable number.

43561648564 is an abundant number, since it is smaller than the sum of its proper divisors (45117422126).

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

43561648564 is a wasteful number, since it uses less digits than its factorization.

43561648564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222253327 (or 222253318 counting only the distinct ones).

The product of its digits is 8294400, while the sum is 52.

The spelling of 43561648564 in words is "forty-three billion, five hundred sixty-one million, six hundred forty-eight thousand, five hundred sixty-four".