51286778364 has 12 divisors (see below), whose sum is σ = 119669149544. Its totient is φ = 17095592784.

The previous prime is 51286778359. The next prime is 51286778381. The reversal of 51286778364 is 46387768215.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2136949087 + ... + 2136949110.

Almost surely, 2^51286778364 is an apocalyptic number.

It is an amenable number.

51286778364 is an abundant number, since it is smaller than the sum of its proper divisors (68382371180).

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

51286778364 is a wasteful number, since it uses less digits than its factorization.

51286778364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4273898204 (or 4273898202 counting only the distinct ones).

The product of its digits is 13547520, while the sum is 57.

The spelling of 51286778364 in words is "fifty-one billion, two hundred eighty-six million, seven hundred seventy-eight thousand, three hundred sixty-four".