68439623351 has 16 divisors (see below), whose sum is σ = 75702781440. Its totient is φ = 61350448320.

The previous prime is 68439623327. The next prime is 68439623419. The reversal of 68439623351 is 15332693486.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68439623351 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 68439623351.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68439623311) 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, 4424036 + ... + 4439478.

It is an arithmetic number, because the mean of its divisors is an integer number (4731423840).

Almost surely, 2^68439623351 is an apocalyptic number.

68439623351 is a deficient number, since it is larger than the sum of its proper divisors (7263158089).

68439623351 is a wasteful number, since it uses less digits than its factorization.

68439623351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21046.

The product of its digits is 2799360, while the sum is 50.

The spelling of 68439623351 in words is "sixty-eight billion, four hundred thirty-nine million, six hundred twenty-three thousand, three hundred fifty-one".