18664242186485 has 96 divisors (see below), whose sum is σ = 28353641902560. Its totient is φ = 11714888908800.

The previous prime is 18664242186479. The next prime is 18664242186521. The reversal of 18664242186485 is 58468124246681.

It is a happy number.

It can be written as a sum of positive squares in 16 ways, for example, as 8041948803889 + 10622293382596 = 2835833^2 + 3259186^2 .

It is not a de Polignac number, because 18664242186485 - 2⁸ = 18664242186229 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 22199075 + ... + 23024495.

It is an arithmetic number, because the mean of its divisors is an integer number (295350436485).

Almost surely, 2^{18664242186485} is an apocalyptic number.

It is an amenable number.

18664242186485 is a deficient number, since it is larger than the sum of its proper divisors (9689399716075).

18664242186485 is a wasteful number, since it uses less digits than its factorization.

18664242186485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 825607 (or 825600 counting only the distinct ones).

The product of its digits is 141557760, while the sum is 65.

The spelling of 18664242186485 in words is "eighteen trillion, six hundred sixty-four billion, two hundred forty-two million, one hundred eighty-six thousand, four hundred eighty-five".