68812856731 has 2 divisors, whose sum is σ = 68812856732. Its totient is φ = 68812856730.

The previous prime is 68812856633. The next prime is 68812856753. The reversal of 68812856731 is 13765821886.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68812856731 - 2¹³ = 68812848539 is a prime.

It is a super-2 number, since 2×68812856731² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (68812856531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34406428365 + 34406428366.

It is an arithmetic number, because the mean of its divisors is an integer number (34406428366).

Almost surely, 2^68812856731 is an apocalyptic number.

68812856731 is a deficient number, since it is larger than the sum of its proper divisors (1).

68812856731 is an equidigital number, since it uses as much as digits as its factorization.

68812856731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3870720, while the sum is 55.

The spelling of 68812856731 in words is "sixty-eight billion, eight hundred twelve million, eight hundred fifty-six thousand, seven hundred thirty-one".