18723457426 has 8 divisors (see below), whose sum is σ = 28119067020. Its totient is φ = 9350435088.

The previous prime is 18723457421. The next prime is 18723457429. The reversal of 18723457426 is 62475432781.

It can be written as a sum of positive squares in 2 ways, for example, as 17034165225 + 1689292201 = 130515^2 + 41101^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 18723457426.

It is not an unprimeable number, because it can be changed into a prime (18723457421) 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, 5644741 + ... + 5648056.

Almost surely, 2^18723457426 is an apocalyptic number.

18723457426 is a deficient number, since it is larger than the sum of its proper divisors (9395609594).

18723457426 is a wasteful number, since it uses less digits than its factorization.

18723457426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11293628.

The product of its digits is 2257920, while the sum is 49.

The spelling of 18723457426 in words is "eighteen billion, seven hundred twenty-three million, four hundred fifty-seven thousand, four hundred twenty-six".