19864636699 has 4 divisors (see below), whose sum is σ = 19929342664. Its totient is φ = 19799930736.

The previous prime is 19864636681. The next prime is 19864636739. The reversal of 19864636699 is 99663646891.

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 19864636699 - 2¹³ = 19864628507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19864636639) by changing a digit.

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, 32352522 + ... + 32353135.

It is an arithmetic number, because the mean of its divisors is an integer number (4982335666).

Almost surely, 2^19864636699 is an apocalyptic number.

19864636699 is a deficient number, since it is larger than the sum of its proper divisors (64705965).

19864636699 is an equidigital number, since it uses as much as digits as its factorization.

19864636699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64705964.

The product of its digits is 90699264, while the sum is 67.

The spelling of 19864636699 in words is "nineteen billion, eight hundred sixty-four million, six hundred thirty-six thousand, six hundred ninety-nine".