19665464628 has 48 divisors (see below), whose sum is σ = 47722868480. Its totient is φ = 6297243264.

The previous prime is 19665464563. The next prime is 19665464701. The reversal of 19665464628 is 82646456691.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 245251 + ... + 315402.

Almost surely, 2^19665464628 is an apocalyptic number.

It is an amenable number.

19665464628 is an abundant number, since it is smaller than the sum of its proper divisors (28057403852).

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

19665464628 is a wasteful number, since it uses less digits than its factorization.

19665464628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 560776 (or 560774 counting only the distinct ones).

The product of its digits is 14929920, while the sum is 57.

The spelling of 19665464628 in words is "nineteen billion, six hundred sixty-five million, four hundred sixty-four thousand, six hundred twenty-eight".