68181607919 has 4 divisors (see below), whose sum is σ = 68206413000. Its totient is φ = 68156802840.

The previous prime is 68181607873. The next prime is 68181607969. The reversal of 68181607919 is 91970618186.

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-68181607919 is a prime.

It is a super-2 number, since 2×68181607919² (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 (68181607969) 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, 12398417 + ... + 12403914.

It is an arithmetic number, because the mean of its divisors is an integer number (17051603250).

Almost surely, 2^68181607919 is an apocalyptic number.

68181607919 is a deficient number, since it is larger than the sum of its proper divisors (24805081).

68181607919 is a wasteful number, since it uses less digits than its factorization.

68181607919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24805080.

The product of its (nonzero) digits is 1306368, while the sum is 56.

The spelling of 68181607919 in words is "sixty-eight billion, one hundred eighty-one million, six hundred seven thousand, nine hundred nineteen".