19663499452 has 12 divisors (see below), whose sum is σ = 34424291440. Its totient is φ = 9827987616.

The previous prime is 19663499417. The next prime is 19663499507. The reversal of 19663499452 is 25499436691.

It is a happy number.

It is a hoax number, since the sum of its digits (58) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 928752 + ... + 949687.

Almost surely, 2^19663499452 is an apocalyptic number.

It is an amenable number.

19663499452 is a deficient number, since it is larger than the sum of its proper divisors (14760791988).

19663499452 is a wasteful number, since it uses less digits than its factorization.

19663499452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1881060 (or 1881058 counting only the distinct ones).

The product of its digits is 12597120, while the sum is 58.

The spelling of 19663499452 in words is "nineteen billion, six hundred sixty-three million, four hundred ninety-nine thousand, four hundred fifty-two".