51643432880 has 40 divisors (see below), whose sum is σ = 129307213392. Its totient is φ = 19068344064.

The previous prime is 51643432853. The next prime is 51643432889. The reversal of 51643432880 is 8823434615.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (51643432889) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24827534 + ... + 24829613.

Almost surely, 2^51643432880 is an apocalyptic number.

It is an amenable number.

51643432880 is an abundant number, since it is smaller than the sum of its proper divisors (77663780512).

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

51643432880 is a wasteful number, since it uses less digits than its factorization.

51643432880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49657173 (or 49657167 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 44.

The spelling of 51643432880 in words is "fifty-one billion, six hundred forty-three million, four hundred thirty-two thousand, eight hundred eighty".