618446666 has 4 divisors (see below), whose sum is σ = 927670002. Its totient is φ = 309223332.

The previous prime is 618446659. The next prime is 618446687. The reversal of 618446666 is 666644816.

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., 502432225 + 116014441 = 22415^2 + 10771^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 618446666.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 154611665 + ... + 154611668.

Almost surely, 2^618446666 is an apocalyptic number.

618446666 is a deficient number, since it is larger than the sum of its proper divisors (309223336).

618446666 is a wasteful number, since it uses less digits than its factorization.

618446666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309223335.

The product of its digits is 995328, while the sum is 47.

The square root of 618446666 is about 24868.5879373960. The cubic root of 618446666 is about 851.9891894343.

The spelling of 618446666 in words is "six hundred eighteen million, four hundred forty-six thousand, six hundred sixty-six".