68311881091 has 2 divisors, whose sum is σ = 68311881092. Its totient is φ = 68311881090.

The previous prime is 68311881067. The next prime is 68311881107. The reversal of 68311881091 is 19018811386.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68311881091 is a prime.

It is not a weakly prime, because it can be changed into another prime (68311881041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34155940545 + 34155940546.

It is an arithmetic number, because the mean of its divisors is an integer number (34155940546).

Almost surely, 2^68311881091 is an apocalyptic number.

68311881091 is a deficient number, since it is larger than the sum of its proper divisors (1).

68311881091 is an equidigital number, since it uses as much as digits as its factorization.

68311881091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82944, while the sum is 46.

The spelling of 68311881091 in words is "sixty-eight billion, three hundred eleven million, eight hundred eighty-one thousand, ninety-one".