18766491442 has 4 divisors (see below), whose sum is σ = 28149737166. Its totient is φ = 9383245720.

The previous prime is 18766491439. The next prime is 18766491467. The reversal of 18766491442 is 24419466781.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 17908060041 + 858431401 = 133821^2 + 29299^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18766491442.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4691622859 + ... + 4691622862.

Almost surely, 2^18766491442 is an apocalyptic number.

18766491442 is a deficient number, since it is larger than the sum of its proper divisors (9383245724).

18766491442 is an equidigital number, since it uses as much as digits as its factorization.

18766491442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9383245723.

The product of its digits is 2322432, while the sum is 52.

The spelling of 18766491442 in words is "eighteen billion, seven hundred sixty-six million, four hundred ninety-one thousand, four hundred forty-two".