51915932640 has 960 divisors, whose sum is σ = 218071465920. Its totient is φ = 11466178560.

The previous prime is 51915932611. The next prime is 51915932657. The reversal of 51915932640 is 4623951915.

51915932640 is a `hidden beast` number, since 5 + 19 + 1 + 593 + 2 + 6 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 202007392 + ... + 202007648.

It is an arithmetic number, because the mean of its divisors is an integer number (227157777).

Almost surely, 2^51915932640 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 51915932640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109035732960).

51915932640 is an abundant number, since it is smaller than the sum of its proper divisors (166155533280).

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

51915932640 is a wasteful number, since it uses less digits than its factorization.

51915932640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417 (or 400 counting only the distinct ones).

The product of its (nonzero) digits is 291600, while the sum is 45.

The spelling of 51915932640 in words is "fifty-one billion, nine hundred fifteen million, nine hundred thirty-two thousand, six hundred forty".