51451994960 has 40 divisors (see below), whose sum is σ = 120067362816. Its totient is φ = 20504845440.

The previous prime is 51451994953. The next prime is 51451994981. The reversal of 51451994960 is 6949915415.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1164944 + ... + 1208303.

Almost surely, 2^51451994960 is an apocalyptic number.

It is an amenable number.

51451994960 is an abundant number, since it is smaller than the sum of its proper divisors (68615367856).

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

51451994960 is a wasteful number, since it uses less digits than its factorization.

51451994960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2373531 (or 2373525 counting only the distinct ones).

The product of its (nonzero) digits is 1749600, while the sum is 53.

The spelling of 51451994960 in words is "fifty-one billion, four hundred fifty-one million, nine hundred ninety-four thousand, nine hundred sixty".