51465913320 has 256 divisors, whose sum is σ = 165876480000. Its totient is φ = 12735968256.

The previous prime is 51465913307. The next prime is 51465913379. The reversal of 51465913320 is 2331956415.

It is a Cunningham number, because it is equal to 226861²-1.

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, 30398394 + ... + 30400086.

It is an arithmetic number, because the mean of its divisors is an integer number (647955000).

Almost surely, 2^51465913320 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 51465913320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82938240000).

51465913320 is an abundant number, since it is smaller than the sum of its proper divisors (114410566680).

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

51465913320 is a wasteful number, since it uses less digits than its factorization.

51465913320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1992 (or 1988 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 39.

The spelling of 51465913320 in words is "fifty-one billion, four hundred sixty-five million, nine hundred thirteen thousand, three hundred twenty".