18643113947 has 8 divisors (see below), whose sum is σ = 18840514896. Its totient is φ = 18445819392.

The previous prime is 18643113943. The next prime is 18643114003. The reversal of 18643113947 is 74931134681.

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 18643113947 - 2² = 18643113943 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18643113943) 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, 354383 + ... + 403575.

It is an arithmetic number, because the mean of its divisors is an integer number (2355064362).

Almost surely, 2^18643113947 is an apocalyptic number.

18643113947 is a deficient number, since it is larger than the sum of its proper divisors (197400949).

18643113947 is an equidigital number, since it uses as much as digits as its factorization.

18643113947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53197.

The product of its digits is 435456, while the sum is 47.

The spelling of 18643113947 in words is "eighteen billion, six hundred forty-three million, one hundred thirteen thousand, nine hundred forty-seven".