666612744566 has 4 divisors (see below), whose sum is σ = 999919116852. Its totient is φ = 333306372282.

The previous prime is 666612744563. The next prime is 666612744569. The reversal of 666612744566 is 665447216666.

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

It is an interprime number because it is at equal distance from previous prime (666612744563) and next prime (666612744569).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666612744563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166653186140 + ... + 166653186143.

It is an arithmetic number, because the mean of its divisors is an integer number (249979779213).

Almost surely, 2^666612744566 is an apocalyptic number.

666612744566 is a deficient number, since it is larger than the sum of its proper divisors (333306372286).

666612744566 is a wasteful number, since it uses less digits than its factorization.

666612744566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333306372285.

The product of its digits is 52254720, while the sum is 59.

The spelling of 666612744566 in words is "six hundred sixty-six billion, six hundred twelve million, seven hundred forty-four thousand, five hundred sixty-six".