68692697081 has 2 divisors, whose sum is σ = 68692697082. Its totient is φ = 68692697080.

The previous prime is 68692697057. The next prime is 68692697083. The reversal of 68692697081 is 18079629686.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46576545856 + 22116151225 = 215816^2 + 148715^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68692697081 is a prime.

It is a super-2 number, since 2×68692697081² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 68692697083, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (68692697083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34346348540 + 34346348541.

It is an arithmetic number, because the mean of its divisors is an integer number (34346348541).

Almost surely, 2^68692697081 is an apocalyptic number.

It is an amenable number.

68692697081 is a deficient number, since it is larger than the sum of its proper divisors (1).

68692697081 is an equidigital number, since it uses as much as digits as its factorization.

68692697081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15676416, while the sum is 62.

The spelling of 68692697081 in words is "sixty-eight billion, six hundred ninety-two million, six hundred ninety-seven thousand, eighty-one".