68611919 has 4 divisors (see below), whose sum is σ = 68713944. Its totient is φ = 68509896.

The previous prime is 68611913. The next prime is 68611927. The reversal of 68611919 is 91911686.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91911686 = 2 ⋅45955843.

It is a cyclic number.

It is not a de Polignac number, because 68611919 - 2⁸ = 68611663 is a prime.

It is a super-2 number, since 2×68611919² = 9415190857725122, 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 (68611913) 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, 49997 + ... + 51350.

It is an arithmetic number, because the mean of its divisors is an integer number (17178486).

Almost surely, 2^68611919 is an apocalyptic number.

68611919 is a deficient number, since it is larger than the sum of its proper divisors (102025).

68611919 is a wasteful number, since it uses less digits than its factorization.

68611919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102024.

The product of its digits is 23328, while the sum is 41.

The square root of 68611919 is about 8283.2311931999. The cubic root of 68611919 is about 409.3861903901.

The spelling of 68611919 in words is "sixty-eight million, six hundred eleven thousand, nine hundred nineteen".