51531358032 has 960 divisors, whose sum is σ = 198672998400. Its totient is φ = 12733459200.

The previous prime is 51531358027. The next prime is 51531358033. The reversal of 51531358032 is 23085313515.

51531358032 is a `hidden beast` number, since 5 + 15 + 31 + 3 + 580 + 32 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51531358033) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 873412819 + ... + 873412877.

It is an arithmetic number, because the mean of its divisors is an integer number (206951040).

Almost surely, 2^51531358032 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 51531358032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99336499200).

51531358032 is an abundant number, since it is smaller than the sum of its proper divisors (147141640368).

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

51531358032 is a wasteful number, since it uses less digits than its factorization.

51531358032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154 (or 113 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

The spelling of 51531358032 in words is "fifty-one billion, five hundred thirty-one million, three hundred fifty-eight thousand, thirty-two".