68109574889731 has 4 divisors (see below), whose sum is σ = 68783927116464. Its totient is φ = 67435222663000.

The previous prime is 68109574889723. The next prime is 68109574889761. The reversal of 68109574889731 is 13798847590186.

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 68109574889731 - 2³ = 68109574889723 is a prime.

It is a super-2 number, since 2×68109574889731² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68109574889711) 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, 337176113215 + ... + 337176113416.

It is an arithmetic number, because the mean of its divisors is an integer number (17195981779116).

Almost surely, 2^{68109574889731} is an apocalyptic number.

68109574889731 is a deficient number, since it is larger than the sum of its proper divisors (674352226733).

68109574889731 is a wasteful number, since it uses less digits than its factorization.

68109574889731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 674352226732.

The product of its (nonzero) digits is 731566080, while the sum is 76.

The spelling of 68109574889731 in words is "sixty-eight trillion, one hundred nine billion, five hundred seventy-four million, eight hundred eighty-nine thousand, seven hundred thirty-one".