68438653999 has 6 divisors (see below), whose sum is σ = 72230269560. Its totient is φ = 64836619236.

The previous prime is 68438653957. The next prime is 68438654021. The reversal of 68438653999 is 99935683486.

It is not a de Polignac number, because 68438653999 - 2³³ = 59848719407 is a prime.

It is a super-2 number, since 2×68438653999² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68438653399) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 94790019 + ... + 94790740.

It is an arithmetic number, because the mean of its divisors is an integer number (12038378260).

Almost surely, 2^68438653999 is an apocalyptic number.

68438653999 is a deficient number, since it is larger than the sum of its proper divisors (3791615561).

68438653999 is a wasteful number, since it uses less digits than its factorization.

68438653999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189580797 (or 189580778 counting only the distinct ones).

The product of its digits is 302330880, while the sum is 70.

The spelling of 68438653999 in words is "sixty-eight billion, four hundred thirty-eight million, six hundred fifty-three thousand, nine hundred ninety-nine".