18278050666 has 8 divisors (see below), whose sum is σ = 27420159780. Its totient is φ = 9137997408.

The previous prime is 18278050663. The next prime is 18278050729. The reversal of 18278050666 is 66605087281.

It can be written as a sum of positive squares in 2 ways, for example, as 17810237025 + 467813641 = 133455^2 + 21629^2 .

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

It is a super-2 number, since 2×18278050666² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18278050663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 491541 + ... + 527416.

Almost surely, 2^18278050666 is an apocalyptic number.

18278050666 is a deficient number, since it is larger than the sum of its proper divisors (9142109114).

18278050666 is a wasteful number, since it uses less digits than its factorization.

18278050666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1027928.

The product of its (nonzero) digits is 967680, while the sum is 49.

The spelling of 18278050666 in words is "eighteen billion, two hundred seventy-eight million, fifty thousand, six hundred sixty-six".