68268689793 has 6 divisors (see below), whose sum is σ = 98610329714. Its totient is φ = 45512459856.

The previous prime is 68268689773. The next prime is 68268689809. The reversal of 68268689793 is 39798686286.

It can be written as a sum of positive squares in only one way, i.e., 48738068289 + 19530621504 = 220767^2 + 139752^2 .

It is not a de Polignac number, because 68268689793 - 2⁶ = 68268689729 is a prime.

It is a super-2 number, since 2×68268689793² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68268689773) 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, 3792704980 + ... + 3792704997.

Almost surely, 2^68268689793 is an apocalyptic number.

It is an amenable number.

68268689793 is a deficient number, since it is larger than the sum of its proper divisors (30341639921).

68268689793 is a wasteful number, since it uses less digits than its factorization.

68268689793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7585409983 (or 7585409980 counting only the distinct ones).

The product of its digits is 376233984, while the sum is 72.

The spelling of 68268689793 in words is "sixty-eight billion, two hundred sixty-eight million, six hundred eighty-nine thousand, seven hundred ninety-three".