18215210199 has 16 divisors (see below), whose sum is σ = 24625036800. Its totient is φ = 11974812096.

The previous prime is 18215210159. The next prime is 18215210207. The reversal of 18215210199 is 99101251281.

It is a happy number.

It is not a de Polignac number, because 18215210199 - 2²⁴ = 18198432983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18215210159) 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 15 ways as a sum of consecutive naturals, for example, 144232 + ... + 239234.

It is an arithmetic number, because the mean of its divisors is an integer number (1539064800).

Almost surely, 2^18215210199 is an apocalyptic number.

18215210199 is a deficient number, since it is larger than the sum of its proper divisors (6409826601).

18215210199 is an equidigital number, since it uses as much as digits as its factorization.

18215210199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95894.

The product of its (nonzero) digits is 12960, while the sum is 39.

The spelling of 18215210199 in words is "eighteen billion, two hundred fifteen million, two hundred ten thousand, one hundred ninety-nine".