18404252443 has 4 divisors (see below), whose sum is σ = 18404822128. Its totient is φ = 18403682760.

The previous prime is 18404252407. The next prime is 18404252501. The reversal of 18404252443 is 34425240481.

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

It is a cyclic number.

It is not a de Polignac number, because 18404252443 - 2²⁵ = 18370698011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18404232443) 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, 233271 + ... + 302032.

It is an arithmetic number, because the mean of its divisors is an integer number (4601205532).

Almost surely, 2^18404252443 is an apocalyptic number.

18404252443 is a deficient number, since it is larger than the sum of its proper divisors (569685).

18404252443 is an equidigital number, since it uses as much as digits as its factorization.

18404252443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 569684.

The product of its (nonzero) digits is 122880, while the sum is 37.

The spelling of 18404252443 in words is "eighteen billion, four hundred four million, two hundred fifty-two thousand, four hundred forty-three".