51868419639 has 16 divisors (see below), whose sum is σ = 70429736832. Its totient is φ = 33946548768.

The previous prime is 51868419541. The next prime is 51868419667. The reversal of 51868419639 is 93691486815.

It is not a de Polignac number, because 51868419639 - 2³² = 47573452343 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51868419739) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 381469 + ... + 499254.

It is an arithmetic number, because the mean of its divisors is an integer number (4401858552).

Almost surely, 2^51868419639 is an apocalyptic number.

51868419639 is a deficient number, since it is larger than the sum of its proper divisors (18561317193).

51868419639 is a wasteful number, since it uses less digits than its factorization.

51868419639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 881086.

The product of its digits is 11197440, while the sum is 60.

The spelling of 51868419639 in words is "fifty-one billion, eight hundred sixty-eight million, four hundred nineteen thousand, six hundred thirty-nine".