51319955040 has 96 divisors (see below), whose sum is σ = 162626123520. Its totient is φ = 13603352064.

The previous prime is 51319955033. The next prime is 51319955041. The reversal of 51319955040 is 4055991315.

It is a tau number, because it is divible by the number of its divisors (96).

It is a junction number, because it is equal to n+sod(n) for n = 51319954983 and 51319955001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51319955041) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 239950 + ... + 400269.

It is an arithmetic number, because the mean of its divisors is an integer number (1694022120).

Almost surely, 2^51319955040 is an apocalyptic number.

It is an amenable number.

51319955040 is an abundant number, since it is smaller than the sum of its proper divisors (111306168480).

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

51319955040 is a wasteful number, since it uses less digits than its factorization.

51319955040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640404 (or 640396 counting only the distinct ones).

The product of its (nonzero) digits is 121500, while the sum is 42.

The spelling of 51319955040 in words is "fifty-one billion, three hundred nineteen million, nine hundred fifty-five thousand, forty".