51894910464 has 160 divisors (see below), whose sum is σ = 147734785440. Its totient is φ = 16130506752.

The previous prime is 51894910451. The next prime is 51894910477. The reversal of 51894910464 is 46401949815.

It is an interprime number because it is at equal distance from previous prime (51894910451) and next prime (51894910477).

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2837092 + ... + 2855324.

It is an arithmetic number, because the mean of its divisors is an integer number (923342409).

Almost surely, 2^51894910464 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 51894910464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73867392720).

51894910464 is an abundant number, since it is smaller than the sum of its proper divisors (95839874976).

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

51894910464 is a wasteful number, since it uses less digits than its factorization.

51894910464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18380 (or 18364 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 51.

The spelling of 51894910464 in words is "fifty-one billion, eight hundred ninety-four million, nine hundred ten thousand, four hundred sixty-four".