68687716261 has 2 divisors, whose sum is σ = 68687716262. Its totient is φ = 68687716260.

The previous prime is 68687716081. The next prime is 68687716303. The reversal of 68687716261 is 16261778686.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58138372161 + 10549344100 = 241119^2 + 102710^2 .

It is a cyclic number.

It is not a de Polignac number, because 68687716261 - 2¹³ = 68687708069 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 68687716196 and 68687716205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68687716061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34343858130 + 34343858131.

It is an arithmetic number, because the mean of its divisors is an integer number (34343858131).

Almost surely, 2^68687716261 is an apocalyptic number.

It is an amenable number.

68687716261 is a deficient number, since it is larger than the sum of its proper divisors (1).

68687716261 is an equidigital number, since it uses as much as digits as its factorization.

68687716261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8128512, while the sum is 58.

The spelling of 68687716261 in words is "sixty-eight billion, six hundred eighty-seven million, seven hundred sixteen thousand, two hundred sixty-one".