18866419983 has 36 divisors (see below), whose sum is σ = 28453533888. Its totient is φ = 12033711360.

The previous prime is 18866419973. The next prime is 18866419993. The reversal of 18866419983 is 38991466881.

18866419983 is a `hidden beast` number, since 1 + 88 + 66 + 419 + 9 + 83 = 666.

It is an interprime number because it is at equal distance from previous prime (18866419973) and next prime (18866419993).

It is not a de Polignac number, because 18866419983 - 2⁹ = 18866419471 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18866419983.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18866419973) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2205691 + ... + 2214227.

Almost surely, 2^18866419983 is an apocalyptic number.

18866419983 is a deficient number, since it is larger than the sum of its proper divisors (9587113905).

18866419983 is an equidigital number, since it uses as much as digits as its factorization.

18866419983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8752 (or 8660 counting only the distinct ones).

The product of its digits is 17915904, while the sum is 63.

The spelling of 18866419983 in words is "eighteen billion, eight hundred sixty-six million, four hundred nineteen thousand, nine hundred eighty-three".