19665464627 has 16 divisors (see below), whose sum is σ = 20180275200. Its totient is φ = 19154918880.

The previous prime is 19665464563. The next prime is 19665464701. The reversal of 19665464627 is 72646456691.

It is not a de Polignac number, because 19665464627 - 2⁶ = 19665464563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19665484627) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12130877 + ... + 12132497.

It is an arithmetic number, because the mean of its divisors is an integer number (1261267200).

Almost surely, 2^19665464627 is an apocalyptic number.

19665464627 is a deficient number, since it is larger than the sum of its proper divisors (514810573).

19665464627 is a wasteful number, since it uses less digits than its factorization.

19665464627 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2746.

The product of its digits is 13063680, while the sum is 56.

The spelling of 19665464627 in words is "nineteen billion, six hundred sixty-five million, four hundred sixty-four thousand, six hundred twenty-seven".