68201995681 has 2 divisors, whose sum is σ = 68201995682. Its totient is φ = 68201995680.

The previous prime is 68201995639. The next prime is 68201995691. The reversal of 68201995681 is 18659910286.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55648810000 + 12553185681 = 235900^2 + 112041^2 .

It is a cyclic number.

It is not a de Polignac number, because 68201995681 - 2¹⁷ = 68201864609 is a prime.

It is a super-2 number, since 2×68201995681² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (68201995691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34100997840 + 34100997841.

It is an arithmetic number, because the mean of its divisors is an integer number (34100997841).

Almost surely, 2^68201995681 is an apocalyptic number.

It is an amenable number.

68201995681 is a deficient number, since it is larger than the sum of its proper divisors (1).

68201995681 is an equidigital number, since it uses as much as digits as its factorization.

68201995681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1866240, while the sum is 55.

The spelling of 68201995681 in words is "sixty-eight billion, two hundred one million, nine hundred ninety-five thousand, six hundred eighty-one".