51194944520 has 16 divisors (see below), whose sum is σ = 115188625260. Its totient is φ = 20477977792.

The previous prime is 51194944481. The next prime is 51194944523. The reversal of 51194944520 is 2544949115.

It can be written as a sum of positive squares in 2 ways, for example, as 51019063876 + 175880644 = 225874^2 + 13262^2 .

It is not an unprimeable number, because it can be changed into a prime (51194944523) 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 3 ways as a sum of consecutive naturals, for example, 639936767 + ... + 639936846.

Almost surely, 2^51194944520 is an apocalyptic number.

It is an amenable number.

51194944520 is an abundant number, since it is smaller than the sum of its proper divisors (63993680740).

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

51194944520 is a wasteful number, since it uses less digits than its factorization.

51194944520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1279873624 (or 1279873620 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 44.

The spelling of 51194944520 in words is "fifty-one billion, one hundred ninety-four million, nine hundred forty-four thousand, five hundred twenty".