51287815623 has 32 divisors (see below), whose sum is σ = 80649181440. Its totient is φ = 28651656960.

The previous prime is 51287815609. The next prime is 51287815651. The reversal of 51287815623 is 32651878215.

It is a de Polignac number, because none of the positive numbers 2^k-51287815623 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51287815603) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1082190 + ... + 1128587.

It is an arithmetic number, because the mean of its divisors is an integer number (2520286920).

Almost surely, 2^51287815623 is an apocalyptic number.

51287815623 is a deficient number, since it is larger than the sum of its proper divisors (29361365817).

51287815623 is a wasteful number, since it uses less digits than its factorization.

51287815623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2210847.

The product of its digits is 806400, while the sum is 48.

The spelling of 51287815623 in words is "fifty-one billion, two hundred eighty-seven million, eight hundred fifteen thousand, six hundred twenty-three".