18384891925393 has 32 divisors (see below), whose sum is σ = 21977880883200. Its totient is φ = 15036871772736.

The previous prime is 18384891925373. The next prime is 18384891925403. The reversal of 18384891925393 is 39352919848381.

It is a cyclic number.

It is not a de Polignac number, because 18384891925393 - 2⁹ = 18384891924881 is a prime.

It is a super-2 number, since 2×18384891925393² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18384891925363) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 679423698 + ... + 679450756.

It is an arithmetic number, because the mean of its divisors is an integer number (686808777600).

Almost surely, 2^{18384891925393} is an apocalyptic number.

It is an amenable number.

18384891925393 is a deficient number, since it is larger than the sum of its proper divisors (3592988957807).

18384891925393 is a wasteful number, since it uses less digits than its factorization.

18384891925393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37141.

The product of its digits is 403107840, while the sum is 73.

The spelling of 18384891925393 in words is "eighteen trillion, three hundred eighty-four billion, eight hundred ninety-one million, nine hundred twenty-five thousand, three hundred ninety-three".