68518519 has 4 divisors (see below), whose sum is σ = 69288480. Its totient is φ = 67748560.

The previous prime is 68518511. The next prime is 68518523. The reversal of 68518519 is 91581586.

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 68518519 - 2³ = 68518511 is a prime.

It is a super-2 number, since 2×68518519² = 9389574891906722, which 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 (68518511) 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, 384847 + ... + 385024.

It is an arithmetic number, because the mean of its divisors is an integer number (17322120).

Almost surely, 2^68518519 is an apocalyptic number.

68518519 is a deficient number, since it is larger than the sum of its proper divisors (769961).

68518519 is an equidigital number, since it uses as much as digits as its factorization.

68518519 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 769960.

The product of its digits is 86400, while the sum is 43.

The square root of 68518519 is about 8277.5913767231. The cubic root of 68518519 is about 409.2003430225.

The spelling of 68518519 in words is "sixty-eight million, five hundred eighteen thousand, five hundred nineteen".