693688413661 has 2 divisors, whose sum is σ = 693688413662. Its totient is φ = 693688413660.

The previous prime is 693688413589. The next prime is 693688413679. The reversal of 693688413661 is 166314886396.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 686546473561 + 7141940100 = 828581^2 + 84510^2 .

It is a cyclic number.

It is not a de Polignac number, because 693688413661 - 2¹³ = 693688405469 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 693688413661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (693688413361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 346844206830 + 346844206831.

It is an arithmetic number, because the mean of its divisors is an integer number (346844206831).

Almost surely, 2^693688413661 is an apocalyptic number.

It is an amenable number.

693688413661 is a deficient number, since it is larger than the sum of its proper divisors (1).

693688413661 is an equidigital number, since it uses as much as digits as its factorization.

693688413661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26873856, while the sum is 61.

The spelling of 693688413661 in words is "six hundred ninety-three billion, six hundred eighty-eight million, four hundred thirteen thousand, six hundred sixty-one".