19744294661 has 24 divisors (see below), whose sum is σ = 25532527104. Its totient is φ = 15117913440.

The previous prime is 19744294607. The next prime is 19744294741. The reversal of 19744294661 is 16649244791.

It is not a de Polignac number, because 19744294661 - 2³⁰ = 18670552837 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19744294861) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 480185 + ... + 519678.

It is an arithmetic number, because the mean of its divisors is an integer number (1063855296).

Almost surely, 2^19744294661 is an apocalyptic number.

It is an amenable number.

19744294661 is a deficient number, since it is larger than the sum of its proper divisors (5788232443).

19744294661 is a wasteful number, since it uses less digits than its factorization.

19744294661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 999921 (or 999914 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 53.

The spelling of 19744294661 in words is "nineteen billion, seven hundred forty-four million, two hundred ninety-four thousand, six hundred sixty-one".