18649243185 has 64 divisors (see below), whose sum is σ = 33511864320. Its totient is φ = 8800496640.

The previous prime is 18649243181. The next prime is 18649243199. The reversal of 18649243185 is 58134294681.

It is not a de Polignac number, because 18649243185 - 2² = 18649243181 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (18649243181) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 620004 + ... + 649386.

It is an arithmetic number, because the mean of its divisors is an integer number (523622880).

Almost surely, 2^18649243185 is an apocalyptic number.

18649243185 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18649243185 is a deficient number, since it is larger than the sum of its proper divisors (14862621135).

18649243185 is a wasteful number, since it uses less digits than its factorization.

18649243185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29558.

The product of its digits is 1658880, while the sum is 51.

The spelling of 18649243185 in words is "eighteen billion, six hundred forty-nine million, two hundred forty-three thousand, one hundred eighty-five".