18245648921 has 8 divisors (see below), whose sum is σ = 18307770624. Its totient is φ = 18183633840.

The previous prime is 18245648891. The next prime is 18245648963. The reversal of 18245648921 is 12984654281.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18245648921 - 2⁶ = 18245648857 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 18245648921.

It is not an unprimeable number, because it can be changed into a prime (18245648521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 323960 + ... + 376086.

It is an arithmetic number, because the mean of its divisors is an integer number (2288471328).

Almost surely, 2^18245648921 is an apocalyptic number.

It is an amenable number.

18245648921 is a deficient number, since it is larger than the sum of its proper divisors (62121703).

18245648921 is an equidigital number, since it uses as much as digits as its factorization.

18245648921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53311.

The product of its digits is 1105920, while the sum is 50.

The spelling of 18245648921 in words is "eighteen billion, two hundred forty-five million, six hundred forty-eight thousand, nine hundred twenty-one".