68351878917 has 40 divisors (see below), whose sum is σ = 117611411456. Its totient is φ = 38750630688.

The previous prime is 68351878913. The next prime is 68351878939. The reversal of 68351878917 is 71987815386.

It is not a de Polignac number, because 68351878917 - 2² = 68351878913 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68351878913) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 402598 + ... + 546615.

Almost surely, 2^68351878917 is an apocalyptic number.

It is an amenable number.

68351878917 is a deficient number, since it is larger than the sum of its proper divisors (49259532539).

68351878917 is a wasteful number, since it uses less digits than its factorization.

68351878917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 949359 (or 949350 counting only the distinct ones).

The product of its digits is 20321280, while the sum is 63.

The spelling of 68351878917 in words is "sixty-eight billion, three hundred fifty-one million, eight hundred seventy-eight thousand, nine hundred seventeen".