68818511 has 4 divisors (see below), whose sum is σ = 68934000. Its totient is φ = 68703024.

The previous prime is 68818423. The next prime is 68818531. The reversal of 68818511 is 11581886.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11581886 = 2 ⋅5790943.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68818511 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68818531) 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, 56846 + ... + 58043.

It is an arithmetic number, because the mean of its divisors is an integer number (17233500).

Almost surely, 2^68818511 is an apocalyptic number.

68818511 is a deficient number, since it is larger than the sum of its proper divisors (115489).

68818511 is a wasteful number, since it uses less digits than its factorization.

68818511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115488.

The product of its digits is 15360, while the sum is 38.

The square root of 68818511 is about 8295.6923158950. The cubic root of 68818511 is about 409.7966689587.

The spelling of 68818511 in words is "sixty-eight million, eight hundred eighteen thousand, five hundred eleven".