19691544472 has 32 divisors (see below), whose sum is σ = 38123366400. Its totient is φ = 9525492000.

The previous prime is 19691544443. The next prime is 19691544473. The reversal of 19691544472 is 27444519691.

It is a happy number.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19691544473) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1094929 + ... + 1112767.

It is an arithmetic number, because the mean of its divisors is an integer number (1191355200).

Almost surely, 2^19691544472 is an apocalyptic number.

It is an amenable number.

19691544472 is a deficient number, since it is larger than the sum of its proper divisors (18431821928).

19691544472 is a wasteful number, since it uses less digits than its factorization.

19691544472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22327 (or 22323 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 52.

The spelling of 19691544472 in words is "nineteen billion, six hundred ninety-one million, five hundred forty-four thousand, four hundred seventy-two".