18613217085 has 16 divisors (see below), whose sum is σ = 29782858560. Its totient is φ = 9926478720.

The previous prime is 18613217081. The next prime is 18613217099. The reversal of 18613217085 is 58071231681.

It is not a de Polignac number, because 18613217085 - 2² = 18613217081 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18613217081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 431970 + ... + 473100.

It is an arithmetic number, because the mean of its divisors is an integer number (1861428660).

Almost surely, 2^18613217085 is an apocalyptic number.

18613217085 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18613217085 is a deficient number, since it is larger than the sum of its proper divisors (11169641475).

18613217085 is a wasteful number, since it uses less digits than its factorization.

18613217085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71308.

The product of its (nonzero) digits is 80640, while the sum is 42.

The spelling of 18613217085 in words is "eighteen billion, six hundred thirteen million, two hundred seventeen thousand, eighty-five".