18474521641 has 4 divisors (see below), whose sum is σ = 19070473984. Its totient is φ = 17878569300.

The previous prime is 18474521627. The next prime is 18474521687. The reversal of 18474521641 is 14612547481.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18474521641 - 2⁵ = 18474521609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18474521621) 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, 297976125 + ... + 297976186.

It is an arithmetic number, because the mean of its divisors is an integer number (4767618496).

Almost surely, 2^18474521641 is an apocalyptic number.

It is an amenable number.

18474521641 is a deficient number, since it is larger than the sum of its proper divisors (595952343).

18474521641 is an equidigital number, since it uses as much as digits as its factorization.

18474521641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 595952342.

The product of its digits is 215040, while the sum is 43.

The spelling of 18474521641 in words is "eighteen billion, four hundred seventy-four million, five hundred twenty-one thousand, six hundred forty-one".