18763480321 has 8 divisors (see below), whose sum is σ = 19117079784. Its totient is φ = 18412490880.

The previous prime is 18763480291. The next prime is 18763480331. The reversal of 18763480321 is 12308436781.

It can be written as a sum of positive squares in 4 ways, for example, as 3247290225 + 15516190096 = 56985^2 + 124564^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18763480321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18763480331) 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, 637990 + ... + 666751.

It is an arithmetic number, because the mean of its divisors is an integer number (2389634973).

Almost surely, 2^18763480321 is an apocalyptic number.

It is an amenable number.

18763480321 is a deficient number, since it is larger than the sum of its proper divisors (353599463).

18763480321 is a wasteful number, since it uses less digits than its factorization.

18763480321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1305011.

The product of its (nonzero) digits is 193536, while the sum is 43.

The spelling of 18763480321 in words is "eighteen billion, seven hundred sixty-three million, four hundred eighty thousand, three hundred twenty-one".