68617198919 has 4 divisors (see below), whose sum is σ = 68618107944. Its totient is φ = 68616289896.

The previous prime is 68617198831. The next prime is 68617198921. The reversal of 68617198919 is 91989171686.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68617198919 is a prime.

It is a super-2 number, since 2×68617198919² (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 (68617198999) 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, 329897 + ... + 496050.

It is an arithmetic number, because the mean of its divisors is an integer number (17154526986).

Almost surely, 2^68617198919 is an apocalyptic number.

68617198919 is a deficient number, since it is larger than the sum of its proper divisors (909025).

68617198919 is an equidigital number, since it uses as much as digits as its factorization.

68617198919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 909024.

The product of its digits is 11757312, while the sum is 65.

The spelling of 68617198919 in words is "sixty-eight billion, six hundred seventeen million, one hundred ninety-eight thousand, nine hundred nineteen".