18643187951245 has 24 divisors (see below), whose sum is σ = 26427395865312. Its totient is φ = 12515706590400.

The previous prime is 18643187951233. The next prime is 18643187951251. The reversal of 18643187951245 is 54215978134681.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-18643187951245 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1002851811 + ... + 1002870400.

It is an arithmetic number, because the mean of its divisors is an integer number (1101141494388).

Almost surely, 2^{18643187951245} is an apocalyptic number.

It is an amenable number.

18643187951245 is a deficient number, since it is larger than the sum of its proper divisors (7784207914067).

18643187951245 is a wasteful number, since it uses less digits than its factorization.

18643187951245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2005722253 (or 2005722240 counting only the distinct ones).

The product of its digits is 58060800, while the sum is 64.

The spelling of 18643187951245 in words is "eighteen trillion, six hundred forty-three billion, one hundred eighty-seven million, nine hundred fifty-one thousand, two hundred forty-five".