51571905432 has 128 divisors (see below), whose sum is σ = 140010171840. Its totient is φ = 15765995520.

The previous prime is 51571905431. The next prime is 51571905461. The reversal of 51571905432 is 23450917515.

It is a happy number.

It is a super-2 number, since 2×51571905432² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51571905431) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21695028 + ... + 21697404.

Almost surely, 2^51571905432 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51571905432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70005085920).

51571905432 is an abundant number, since it is smaller than the sum of its proper divisors (88438266408).

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

51571905432 is a wasteful number, since it uses less digits than its factorization.

51571905432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3741 (or 3737 counting only the distinct ones).

The product of its (nonzero) digits is 189000, while the sum is 42.

The spelling of 51571905432 in words is "fifty-one billion, five hundred seventy-one million, nine hundred five thousand, four hundred thirty-two".