67693639661 has 2 divisors, whose sum is σ = 67693639662. Its totient is φ = 67693639660.

The previous prime is 67693639633. The next prime is 67693639681. The reversal of 67693639661 is 16693639676.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67668137161 + 25502500 = 260131^2 + 5050^2 .

It is a cyclic number.

It is not a de Polignac number, because 67693639661 - 2²² = 67689445357 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 67693639594 and 67693639603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67693639681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33846819830 + 33846819831.

It is an arithmetic number, because the mean of its divisors is an integer number (33846819831).

Almost surely, 2^67693639661 is an apocalyptic number.

It is an amenable number.

67693639661 is a deficient number, since it is larger than the sum of its proper divisors (1).

67693639661 is an equidigital number, since it uses as much as digits as its factorization.

67693639661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 39680928, while the sum is 62.

The spelling of 67693639661 in words is "sixty-seven billion, six hundred ninety-three million, six hundred thirty-nine thousand, six hundred sixty-one".