19615563966 has 8 divisors (see below), whose sum is σ = 39231127944. Its totient is φ = 6538521320.

The previous prime is 19615563959. The next prime is 19615563971. The reversal of 19615563966 is 66936551691.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

19615563966 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1634630325 + ... + 1634630336.

It is an arithmetic number, because the mean of its divisors is an integer number (4903890993).

Almost surely, 2^19615563966 is an apocalyptic number.

19615563966 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

19615563966 is a wasteful number, since it uses less digits than its factorization.

19615563966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3269260666.

The product of its digits is 7873200, while the sum is 57.

The spelling of 19615563966 in words is "nineteen billion, six hundred fifteen million, five hundred sixty-three thousand, nine hundred sixty-six".