19693649472 has 56 divisors (see below), whose sum is σ = 59549848896. Its totient is φ = 5626756608.

The previous prime is 19693649449. The next prime is 19693649483. The reversal of 19693649472 is 27494639691.

It is a tau number, because it is divible by the number of its divisors (56).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7325163 + ... + 7327850.

Almost surely, 2^19693649472 is an apocalyptic number.

19693649472 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19693649472 is an abundant number, since it is smaller than the sum of its proper divisors (39856199424).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19693649472 is a wasteful number, since it uses less digits than its factorization.

19693649472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14653035 (or 14653025 counting only the distinct ones).

The product of its digits is 17635968, while the sum is 60.

The spelling of 19693649472 in words is "nineteen billion, six hundred ninety-three million, six hundred forty-nine thousand, four hundred seventy-two".