18443211680 has 48 divisors (see below), whose sum is σ = 43824015144. Its totient is φ = 7334630400.

The previous prime is 18443211679. The next prime is 18443211727. The reversal of 18443211680 is 8611234481.

It can be written as a sum of positive squares in 4 ways, for example, as 18405806224 + 37405456 = 135668^2 + 6116^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 305471 + ... + 360830.

Almost surely, 2^18443211680 is an apocalyptic number.

18443211680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18443211680 is an abundant number, since it is smaller than the sum of its proper divisors (25380803464).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18443211680 is a wasteful number, since it uses less digits than its factorization.

18443211680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666489 (or 666481 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 38.

The spelling of 18443211680 in words is "eighteen billion, four hundred forty-three million, two hundred eleven thousand, six hundred eighty".