68813880977 has 4 divisors (see below), whose sum is σ = 70673715636. Its totient is φ = 66954046320.

The previous prime is 68813880917. The next prime is 68813880983. The reversal of 68813880977 is 77908831886.

It is a Cunningham number, because it is equal to 262324²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 61575444736 + 7238436241 = 248144^2 + 85079^2 .

It is a cyclic number.

It is not a de Polignac number, because 68813880977 - 2³⁶ = 94404241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68813880917) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 929917274 + ... + 929917347.

It is an arithmetic number, because the mean of its divisors is an integer number (17668428909).

Almost surely, 2^68813880977 is an apocalyptic number.

It is an amenable number.

68813880977 is a deficient number, since it is larger than the sum of its proper divisors (1859834659).

68813880977 is a wasteful number, since it uses less digits than its factorization.

68813880977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1859834658.

The product of its (nonzero) digits is 32514048, while the sum is 65.

The spelling of 68813880977 in words is "sixty-eight billion, eight hundred thirteen million, eight hundred eighty thousand, nine hundred seventy-seven".