68797636591 has 4 divisors (see below), whose sum is σ = 70397581672. Its totient is φ = 67197691512.

The previous prime is 68797636577. The next prime is 68797636597. The reversal of 68797636591 is 19563679786.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 68797636591 - 2⁷ = 68797636463 is a prime.

It is a super-2 number, since 2×68797636591² (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 (68797636597) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 799972476 + ... + 799972561.

It is an arithmetic number, because the mean of its divisors is an integer number (17599395418).

Almost surely, 2^68797636591 is an apocalyptic number.

68797636591 is a deficient number, since it is larger than the sum of its proper divisors (1599945081).

68797636591 is a wasteful number, since it uses less digits than its factorization.

68797636591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1599945080.

The product of its digits is 102876480, while the sum is 67.

The spelling of 68797636591 in words is "sixty-eight billion, seven hundred ninety-seven million, six hundred thirty-six thousand, five hundred ninety-one".