18126437578 has 16 divisors (see below), whose sum is σ = 28799883720. Its totient is φ = 8526877696.

The previous prime is 18126437573. The next prime is 18126437587. The reversal of 18126437578 is 87573462181.

It can be written as a sum of positive squares in 4 ways, for example, as 12373670169 + 5752767409 = 111237^2 + 75847^2 .

It is not an unprimeable number, because it can be changed into a prime (18126437573) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7423 + ... + 190546.

Almost surely, 2^18126437578 is an apocalyptic number.

18126437578 is a deficient number, since it is larger than the sum of its proper divisors (10673446142).

18126437578 is a wasteful number, since it uses less digits than its factorization.

18126437578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200681.

The product of its digits is 2257920, while the sum is 52.

The spelling of 18126437578 in words is "eighteen billion, one hundred twenty-six million, four hundred thirty-seven thousand, five hundred seventy-eight".