68991403967999 has 16 divisors (see below), whose sum is σ = 72245100480000. Its totient is φ = 65800835987040.

The previous prime is 68991403967987. The next prime is 68991403968037. The reversal of 68991403967999 is 99976930419986.

It is a cyclic number.

It is not a de Polignac number, because 68991403967999 - 2⁸ = 68991403967743 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 (68991403967929) 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, 42200867 + ... + 43805204.

It is an arithmetic number, because the mean of its divisors is an integer number (4515318780000).

Almost surely, 2^{68991403967999} is an apocalyptic number.

68991403967999 is a deficient number, since it is larger than the sum of its proper divisors (3253696512001).

68991403967999 is a wasteful number, since it uses less digits than its factorization.

68991403967999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86006438.

The product of its (nonzero) digits is 12856620672, while the sum is 89.

The spelling of 68991403967999 in words is "sixty-eight trillion, nine hundred ninety-one billion, four hundred three million, nine hundred sixty-seven thousand, nine hundred ninety-nine".