18643825881746 has 32 divisors (see below), whose sum is σ = 30544382534400. Its totient is φ = 8482744791360.

The previous prime is 18643825881743. The next prime is 18643825881757. The reversal of 18643825881746 is 64718852834681.

It is a Harshad number since it is a multiple of its sum of digits (71).

It is a self number, because there is not a number n which added to its sum of digits gives 18643825881746.

It is not an unprimeable number, because it can be changed into a prime (18643825881743) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 16965500 + ... + 18030968.

It is an arithmetic number, because the mean of its divisors is an integer number (954511954200).

Almost surely, 2^{18643825881746} is an apocalyptic number.

18643825881746 is a deficient number, since it is larger than the sum of its proper divisors (11900556652654).

18643825881746 is a wasteful number, since it uses less digits than its factorization.

18643825881746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1075034.

The product of its digits is 495452160, while the sum is 71.

The spelling of 18643825881746 in words is "eighteen trillion, six hundred forty-three billion, eight hundred twenty-five million, eight hundred eighty-one thousand, seven hundred forty-six".