18715861603 has 4 divisors (see below), whose sum is σ = 18863230720. Its totient is φ = 18568492488.

The previous prime is 18715861597. The next prime is 18715861607. The reversal of 18715861603 is 30616851781.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18715861603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18715861607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73684368 + ... + 73684621.

It is an arithmetic number, because the mean of its divisors is an integer number (4715807680).

Almost surely, 2^18715861603 is an apocalyptic number.

18715861603 is a deficient number, since it is larger than the sum of its proper divisors (147369117).

18715861603 is a wasteful number, since it uses less digits than its factorization.

18715861603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147369116.

The product of its (nonzero) digits is 241920, while the sum is 46.

The spelling of 18715861603 in words is "eighteen billion, seven hundred fifteen million, eight hundred sixty-one thousand, six hundred three".