18643734146641 has 4 divisors (see below), whose sum is σ = 18696549257892. Its totient is φ = 18590919035392.

The previous prime is 18643734146627. The next prime is 18643734146743. The reversal of 18643734146641 is 14664143734681.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7108201186641 + 11535532960000 = 2666121^2 + 3396400^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18643734146641 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18643734140641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26407555096 + ... + 26407555801.

It is an arithmetic number, because the mean of its divisors is an integer number (4674137314473).

Almost surely, 2^{18643734146641} is an apocalyptic number.

It is an amenable number.

18643734146641 is a deficient number, since it is larger than the sum of its proper divisors (52815111251).

18643734146641 is an equidigital number, since it uses as much as digits as its factorization.

18643734146641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52815111250.

The product of its digits is 27869184, while the sum is 58.

The spelling of 18643734146641 in words is "eighteen trillion, six hundred forty-three billion, seven hundred thirty-four million, one hundred forty-six thousand, six hundred forty-one".