18226713555599 has 4 divisors (see below), whose sum is σ = 18291118904136. Its totient is φ = 18162308207064.

The previous prime is 18226713555559. The next prime is 18226713555649. The reversal of 18226713555599 is 99555531762281.

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 18226713555599 - 2⁸ = 18226713555343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18226713555539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32202673844 + ... + 32202674409.

It is an arithmetic number, because the mean of its divisors is an integer number (4572779726034).

Almost surely, 2^{18226713555599} is an apocalyptic number.

18226713555599 is a deficient number, since it is larger than the sum of its proper divisors (64405348537).

18226713555599 is an equidigital number, since it uses as much as digits as its factorization.

18226713555599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64405348536.

The product of its digits is 204120000, while the sum is 68.

The spelling of 18226713555599 in words is "eighteen trillion, two hundred twenty-six billion, seven hundred thirteen million, five hundred fifty-five thousand, five hundred ninety-nine".