43453661656 has 32 divisors (see below), whose sum is σ = 88081758000. Its totient is φ = 20027005056.

The previous prime is 43453661639. The next prime is 43453661681. The reversal of 43453661656 is 65616635434.

It is a super-2 number, since 2×43453661656² (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 7 ways as a sum of consecutive naturals, for example, 3857611 + ... + 3868858.

Almost surely, 2^43453661656 is an apocalyptic number.

It is an amenable number.

43453661656 is an abundant number, since it is smaller than the sum of its proper divisors (44628096344).

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

43453661656 is a wasteful number, since it uses less digits than its factorization.

43453661656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7726531 (or 7726527 counting only the distinct ones).

The product of its digits is 4665600, while the sum is 49.

The spelling of 43453661656 in words is "forty-three billion, four hundred fifty-three million, six hundred sixty-one thousand, six hundred fifty-six".