19994655399 has 4 divisors (see below), whose sum is σ = 26659540536. Its totient is φ = 13329770264.

The previous prime is 19994655391. The next prime is 19994655403. The reversal of 19994655399 is 99355649991.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 19994655399 - 2³ = 19994655391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19994655391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3332442564 + ... + 3332442569.

It is an arithmetic number, because the mean of its divisors is an integer number (6664885134).

Almost surely, 2^19994655399 is an apocalyptic number.

19994655399 is a deficient number, since it is larger than the sum of its proper divisors (6664885137).

19994655399 is an equidigital number, since it uses as much as digits as its factorization.

19994655399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6664885136.

The product of its digits is 106288200, while the sum is 69.

The spelling of 19994655399 in words is "nineteen billion, nine hundred ninety-four million, six hundred fifty-five thousand, three hundred ninety-nine".