43431666432 has 432 divisors, whose sum is σ = 146408613120. Its totient is φ = 11187855360.

The previous prime is 43431666403. The next prime is 43431666457. The reversal of 43431666432 is 23466613434.

It is a happy number.

It is a super-2 number, since 2×43431666432² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 116438598 + ... + 116438970.

Almost surely, 2^43431666432 is an apocalyptic number.

43431666432 is a gapful number since it is divisible by the number (42) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 43431666432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73204306560).

43431666432 is an abundant number, since it is smaller than the sum of its proper divisors (102976946688).

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

43431666432 is a wasteful number, since it uses less digits than its factorization.

43431666432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 600 (or 575 counting only the distinct ones).

The product of its digits is 746496, while the sum is 42.

The spelling of 43431666432 in words is "forty-three billion, four hundred thirty-one million, six hundred sixty-six thousand, four hundred thirty-two".