68866683761 has 2 divisors, whose sum is σ = 68866683762. Its totient is φ = 68866683760.

The previous prime is 68866683619. The next prime is 68866683779. The reversal of 68866683761 is 16738666886.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39013755361 + 29852928400 = 197519^2 + 172780^2 .

It is a cyclic number.

It is not a de Polignac number, because 68866683761 - 2²² = 68862489457 is a prime.

It is a super-2 number, since 2×68866683761² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (68766683761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34433341880 + 34433341881.

It is an arithmetic number, because the mean of its divisors is an integer number (34433341881).

Almost surely, 2^68866683761 is an apocalyptic number.

It is an amenable number.

68866683761 is a deficient number, since it is larger than the sum of its proper divisors (1).

68866683761 is an equidigital number, since it uses as much as digits as its factorization.

68866683761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 83607552, while the sum is 65.

The spelling of 68866683761 in words is "sixty-eight billion, eight hundred sixty-six million, six hundred eighty-three thousand, seven hundred sixty-one".