68512811 has 2 divisors, whose sum is σ = 68512812. Its totient is φ = 68512810.

The previous prime is 68512783. The next prime is 68512813. The reversal of 68512811 is 11821586.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68512811 is a prime.

It is a super-2 number, since 2×68512811² = 9388010542243442, which contains 22 as substring.

Together with 68512813, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (68512813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34256405 + 34256406.

It is an arithmetic number, because the mean of its divisors is an integer number (34256406).

Almost surely, 2^68512811 is an apocalyptic number.

68512811 is a deficient number, since it is larger than the sum of its proper divisors (1).

68512811 is an equidigital number, since it uses as much as digits as its factorization.

68512811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3840, while the sum is 32.

The square root of 68512811 is about 8277.2465832546. The cubic root of 68512811 is about 409.1889797665.

The spelling of 68512811 in words is "sixty-eight million, five hundred twelve thousand, eight hundred eleven".