68198519 has 4 divisors (see below), whose sum is σ = 71163696. Its totient is φ = 65233344.

The previous prime is 68198479. The next prime is 68198531. The reversal of 68198519 is 91589186.

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 68198519 - 2²⁴ = 51421303 is a prime.

It is a super-2 number, since 2×68198519² = 9302075987586722, 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 (68198579) 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, 1482554 + ... + 1482599.

It is an arithmetic number, because the mean of its divisors is an integer number (17790924).

Almost surely, 2^68198519 is an apocalyptic number.

68198519 is a deficient number, since it is larger than the sum of its proper divisors (2965177).

68198519 is a wasteful number, since it uses less digits than its factorization.

68198519 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2965176.

The product of its digits is 155520, while the sum is 47.

The square root of 68198519 is about 8258.2394612896. The cubic root of 68198519 is about 408.5623233535.

The spelling of 68198519 in words is "sixty-eight million, one hundred ninety-eight thousand, five hundred nineteen".