51990914880 has 448 divisors, whose sum is σ = 194569689600. Its totient is φ = 13041008640.

The previous prime is 51990914863. The next prime is 51990914891. The reversal of 51990914880 is 8841909915.

51990914880 is a `hidden beast` number, since 519 + 9 + 0 + 9 + 1 + 48 + 80 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 12119776 + ... + 12124064.

Almost surely, 2^51990914880 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 51990914880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97284844800).

51990914880 is an abundant number, since it is smaller than the sum of its proper divisors (142578774720).

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

51990914880 is a wasteful number, since it uses less digits than its factorization.

51990914880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4399 (or 4383 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 54.

The spelling of 51990914880 in words is "fifty-one billion, nine hundred ninety million, nine hundred fourteen thousand, eight hundred eighty".