19420185599 has 4 divisors (see below), whose sum is σ = 19422252480. Its totient is φ = 19418118720.

The previous prime is 19420185593. The next prime is 19420185601. The reversal of 19420185599 is 99558102491.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19420185599 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19420185599.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19420185593) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1019282 + ... + 1038159.

It is an arithmetic number, because the mean of its divisors is an integer number (4855563120).

Almost surely, 2^19420185599 is an apocalyptic number.

19420185599 is a deficient number, since it is larger than the sum of its proper divisors (2066881).

19420185599 is an equidigital number, since it uses as much as digits as its factorization.

19420185599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2066880.

The product of its (nonzero) digits is 1166400, while the sum is 53.

The spelling of 19420185599 in words is "nineteen billion, four hundred twenty million, one hundred eighty-five thousand, five hundred ninety-nine".