68398440767 has 4 divisors (see below), whose sum is σ = 70757007720. Its totient is φ = 66039873816.

The previous prime is 68398440763. The next prime is 68398440769. The reversal of 68398440767 is 76704489386.

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

It is a cyclic number.

It is not a de Polignac number, because 68398440767 - 2² = 68398440763 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68398440763) 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, 1179283433 + ... + 1179283490.

It is an arithmetic number, because the mean of its divisors is an integer number (17689251930).

Almost surely, 2^68398440767 is an apocalyptic number.

68398440767 is a deficient number, since it is larger than the sum of its proper divisors (2358566953).

68398440767 is a wasteful number, since it uses less digits than its factorization.

68398440767 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2358566952.

The product of its (nonzero) digits is 48771072, while the sum is 62.

The spelling of 68398440767 in words is "sixty-eight billion, three hundred ninety-eight million, four hundred forty thousand, seven hundred sixty-seven".