68515131839 has 48 divisors (see below), whose sum is σ = 87677856000. Its totient is φ = 52393376640.

The previous prime is 68515131823. The next prime is 68515131851. The reversal of 68515131839 is 93813151586.

It is not a de Polignac number, because 68515131839 - 2⁴ = 68515131823 is a prime.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68515131859) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 52421024 + ... + 52422330.

It is an arithmetic number, because the mean of its divisors is an integer number (1826622000).

Almost surely, 2^68515131839 is an apocalyptic number.

68515131839 is a deficient number, since it is larger than the sum of its proper divisors (19162724161).

68515131839 is a wasteful number, since it uses less digits than its factorization.

68515131839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2444 (or 2433 counting only the distinct ones).

The product of its digits is 777600, while the sum is 50.

The spelling of 68515131839 in words is "sixty-eight billion, five hundred fifteen million, one hundred thirty-one thousand, eight hundred thirty-nine".