6694135961 has 2 divisors, whose sum is σ = 6694135962. Its totient is φ = 6694135960.

The previous prime is 6694135909. The next prime is 6694135991. The reversal of 6694135961 is 1695314966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6116022025 + 578113936 = 78205^2 + 24044^2 .

It is a cyclic number.

It is not a de Polignac number, because 6694135961 - 2¹⁸ = 6693873817 is a prime.

It is a super-2 number, since 2×6694135961² = 89622912528706787042, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6694135991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3347067980 + 3347067981.

It is an arithmetic number, because the mean of its divisors is an integer number (3347067981).

Almost surely, 2^6694135961 is an apocalyptic number.

It is an amenable number.

6694135961 is a deficient number, since it is larger than the sum of its proper divisors (1).

6694135961 is an equidigital number, since it uses as much as digits as its factorization.

6694135961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1049760, while the sum is 50.

The square root of 6694135961 is about 81817.6995582252. The cubic root of 6694135961 is about 1884.6534750817.

The spelling of 6694135961 in words is "six billion, six hundred ninety-four million, one hundred thirty-five thousand, nine hundred sixty-one".