68597257491 has 24 divisors (see below), whose sum is σ = 113257713920. Its totient is φ = 39192272496.

The previous prime is 68597257483. The next prime is 68597257523. The reversal of 68597257491 is 19475279586.

68597257491 is a `hidden beast` number, since 6 + 8 + 5 + 97 + 2 + 57 + 491 = 666.

It is not a de Polignac number, because 68597257491 - 2³ = 68597257483 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68597257441) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 334746 + ... + 499248.

Almost surely, 2^68597257491 is an apocalyptic number.

68597257491 is a deficient number, since it is larger than the sum of its proper divisors (44660456429).

68597257491 is a wasteful number, since it uses less digits than its factorization.

68597257491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171135 (or 171132 counting only the distinct ones).

The product of its digits is 38102400, while the sum is 63.

The spelling of 68597257491 in words is "sixty-eight billion, five hundred ninety-seven million, two hundred fifty-seven thousand, four hundred ninety-one".