19764841917 has 32 divisors (see below), whose sum is σ = 27398350080. Its totient is φ = 12658705920.

The previous prime is 19764841913. The next prime is 19764841927. The reversal of 19764841917 is 71914846791.

It is not a de Polignac number, because 19764841917 - 2² = 19764841913 is a prime.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19764841913) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25971817 + ... + 25972577.

It is an arithmetic number, because the mean of its divisors is an integer number (856198440).

Almost surely, 2^19764841917 is an apocalyptic number.

It is an amenable number.

19764841917 is a deficient number, since it is larger than the sum of its proper divisors (7633508163).

19764841917 is a wasteful number, since it uses less digits than its factorization.

19764841917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1893.

The product of its digits is 3048192, while the sum is 57.

The spelling of 19764841917 in words is "nineteen billion, seven hundred sixty-four million, eight hundred forty-one thousand, nine hundred seventeen".