51509374836 has 12 divisors (see below), whose sum is σ = 120188541312. Its totient is φ = 17169791608.

The previous prime is 51509374817. The next prime is 51509374853. The reversal of 51509374836 is 63847390515.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2146223940 + ... + 2146223963.

It is an arithmetic number, because the mean of its divisors is an integer number (10015711776).

Almost surely, 2^51509374836 is an apocalyptic number.

It is an amenable number.

51509374836 is an abundant number, since it is smaller than the sum of its proper divisors (68679166476).

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

51509374836 is a wasteful number, since it uses less digits than its factorization.

51509374836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4292447910 (or 4292447908 counting only the distinct ones).

The product of its (nonzero) digits is 2721600, while the sum is 51.

The spelling of 51509374836 in words is "fifty-one billion, five hundred nine million, three hundred seventy-four thousand, eight hundred thirty-six".