51385015644 has 96 divisors (see below), whose sum is σ = 123503493120. Its totient is φ = 16621944768.

The previous prime is 51385015621. The next prime is 51385015651. The reversal of 51385015644 is 44651058315.

It is a junction number, because it is equal to n+sod(n) for n = 51385015596 and 51385015605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 52273177 + ... + 52274159.

It is an arithmetic number, because the mean of its divisors is an integer number (1286494720).

Almost surely, 2^51385015644 is an apocalyptic number.

It is an amenable number.

51385015644 is an abundant number, since it is smaller than the sum of its proper divisors (72118477476).

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

51385015644 is a wasteful number, since it uses less digits than its factorization.

51385015644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1959 (or 1957 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 42.

The spelling of 51385015644 in words is "fifty-one billion, three hundred eighty-five million, fifteen thousand, six hundred forty-four".