18666768446 has 4 divisors (see below), whose sum is σ = 28000152672. Its totient is φ = 9333384222.

The previous prime is 18666768427. The next prime is 18666768457. The reversal of 18666768446 is 64486766681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64486766681 = 112253 ⋅574477.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4666692110 + ... + 4666692113.

It is an arithmetic number, because the mean of its divisors is an integer number (7000038168).

Almost surely, 2^18666768446 is an apocalyptic number.

18666768446 is a deficient number, since it is larger than the sum of its proper divisors (9333384226).

18666768446 is an equidigital number, since it uses as much as digits as its factorization.

18666768446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9333384225.

The product of its digits is 55738368, while the sum is 62.

The spelling of 18666768446 in words is "eighteen billion, six hundred sixty-six million, seven hundred sixty-eight thousand, four hundred forty-six".