19694710661 has 32 divisors (see below), whose sum is σ = 21811553280. Its totient is φ = 17717616000.

The previous prime is 19694710627. The next prime is 19694710667. The reversal of 19694710661 is 16601749691.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 19694710661 - 2¹⁰ = 19694709637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19694710667) 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 in 31 ways as a sum of consecutive naturals, for example, 4232186 + ... + 4236836.

It is an arithmetic number, because the mean of its divisors is an integer number (681611040).

Almost surely, 2^19694710661 is an apocalyptic number.

It is an amenable number.

19694710661 is a deficient number, since it is larger than the sum of its proper divisors (2116842619).

19694710661 is a wasteful number, since it uses less digits than its factorization.

19694710661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4857.

The product of its (nonzero) digits is 489888, while the sum is 50.

The spelling of 19694710661 in words is "nineteen billion, six hundred ninety-four million, seven hundred ten thousand, six hundred sixty-one".