18575421919803 has 24 divisors (see below), whose sum is σ = 30664854272000. Its totient is φ = 10614296374704.

The previous prime is 18575421919781. The next prime is 18575421919823. The reversal of 18575421919803 is 30891912457581.

18575421919803 is a `hidden beast` number, since 1 + 8 + 5 + 7 + 542 + 1 + 9 + 1 + 9 + 80 + 3 = 666.

It is not a de Polignac number, because 18575421919803 - 2⁸ = 18575421919547 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18575421919823) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 254173 + ... + 6100446.

Almost surely, 2^{18575421919803} is an apocalyptic number.

18575421919803 is a deficient number, since it is larger than the sum of its proper divisors (12089432352197).

18575421919803 is a wasteful number, since it uses less digits than its factorization.

18575421919803 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6401031 (or 6401028 counting only the distinct ones).

The product of its (nonzero) digits is 21772800, while the sum is 63.

The spelling of 18575421919803 in words is "eighteen trillion, five hundred seventy-five billion, four hundred twenty-one million, nine hundred nineteen thousand, eight hundred three".