51287197994064 has 80 divisors (see below), whose sum is σ = 151962068170240. Its totient is φ = 16544257413120.

The previous prime is 51287197994063. The next prime is 51287197994117. The reversal of 51287197994064 is 46049979178215.

51287197994064 is a `hidden beast` number, since 5 + 1 + 28 + 7 + 197 + 9 + 9 + 406 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a junction number, because it is equal to n+sod(n) for n = 51287197993983 and 51287197994001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51287197994063) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1914831217 + ... + 1914858000.

It is an arithmetic number, because the mean of its divisors is an integer number (1899525852128).

Almost surely, 2^{51287197994064} is an apocalyptic number.

51287197994064 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

It is an amenable number.

51287197994064 is an abundant number, since it is smaller than the sum of its proper divisors (100674870176176).

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

51287197994064 is a wasteful number, since it uses less digits than its factorization.

51287197994064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3829689265 (or 3829689253 counting only the distinct ones).

The product of its (nonzero) digits is 274337280, while the sum is 72.

The spelling of 51287197994064 in words is "fifty-one trillion, two hundred eighty-seven billion, one hundred ninety-seven million, nine hundred ninety-four thousand, sixty-four".