18245993618 has 4 divisors (see below), whose sum is σ = 27368990430. Its totient is φ = 9122996808.

The previous prime is 18245993603. The next prime is 18245993639. The reversal of 18245993618 is 81639954281.

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

It can be written as a sum of positive squares in only one way, i.e., 9666232489 + 8579761129 = 98317^2 + 92627^2 .

It is a Curzon number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 4561498403 + ... + 4561498406.

Almost surely, 2^18245993618 is an apocalyptic number.

18245993618 is a deficient number, since it is larger than the sum of its proper divisors (9122996812).

18245993618 is an equidigital number, since it uses as much as digits as its factorization.

18245993618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9122996811.

The product of its digits is 3732480, while the sum is 56.

The spelling of 18245993618 in words is "eighteen billion, two hundred forty-five million, nine hundred ninety-three thousand, six hundred eighteen".