18313475721 has 8 divisors (see below), whose sum is σ = 24451931520. Its totient is φ = 12192001872.

The previous prime is 18313475701. The next prime is 18313475723. The reversal of 18313475721 is 12757431381.

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

It is not a de Polignac number, because 18313475721 - 2⁶ = 18313475657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18313475723) 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, 4242970 + ... + 4247283.

It is an arithmetic number, because the mean of its divisors is an integer number (3056491440).

Almost surely, 2^18313475721 is an apocalyptic number.

It is an amenable number.

18313475721 is a deficient number, since it is larger than the sum of its proper divisors (6138455799).

18313475721 is an equidigital number, since it uses as much as digits as its factorization.

18313475721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8490975.

The product of its digits is 141120, while the sum is 42.

The spelling of 18313475721 in words is "eighteen billion, three hundred thirteen million, four hundred seventy-five thousand, seven hundred twenty-one".