51638049875 has 8 divisors (see below), whose sum is σ = 64444286400. Its totient is φ = 41310439800.

The previous prime is 51638049863. The next prime is 51638049889. The reversal of 51638049875 is 57894083615.

It is not a de Polignac number, because 51638049875 - 2¹² = 51638045779 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51638049875.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 206552075 + ... + 206552324.

It is an arithmetic number, because the mean of its divisors is an integer number (8055535800).

Almost surely, 2^51638049875 is an apocalyptic number.

51638049875 is a deficient number, since it is larger than the sum of its proper divisors (12806236525).

51638049875 is an equidigital number, since it uses as much as digits as its factorization.

51638049875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413104414 (or 413104404 counting only the distinct ones).

The product of its (nonzero) digits is 7257600, while the sum is 56.

The spelling of 51638049875 in words is "fifty-one billion, six hundred thirty-eight million, forty-nine thousand, eight hundred seventy-five".