68403991879 has 2 divisors, whose sum is σ = 68403991880. Its totient is φ = 68403991878.

The previous prime is 68403991793. The next prime is 68403991891. The reversal of 68403991879 is 97819930486.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68403991879 - 2¹⁷ = 68403860807 is a prime.

It is a super-3 number, since 3×68403991879³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 68403991879.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68403991379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34201995939 + 34201995940.

It is an arithmetic number, because the mean of its divisors is an integer number (34201995940).

Almost surely, 2^68403991879 is an apocalyptic number.

68403991879 is a deficient number, since it is larger than the sum of its proper divisors (1).

68403991879 is an equidigital number, since it uses as much as digits as its factorization.

68403991879 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23514624, while the sum is 64.

The spelling of 68403991879 in words is "sixty-eight billion, four hundred three million, nine hundred ninety-one thousand, eight hundred seventy-nine".