1667065566 has 16 divisors (see below), whose sum is σ = 3334654224. Its totient is φ = 555601344.

The previous prime is 1667065559. The next prime is 1667065573. The reversal of 1667065566 is 6655607661.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1667065559) and next prime (1667065573).

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 (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28600 + ... + 64436.

It is an arithmetic number, because the mean of its divisors is an integer number (208415889).

Almost surely, 2^1667065566 is an apocalyptic number.

1667065566 is an abundant number, since it is smaller than the sum of its proper divisors (1667588658).

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

1667065566 is a wasteful number, since it uses less digits than its factorization.

1667065566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43595.

The product of its (nonzero) digits is 1360800, while the sum is 48.

The square root of 1667065566 is about 40829.7142532249. The cubic root of 1667065566 is about 1185.7256834425.

The spelling of 1667065566 in words is "one billion, six hundred sixty-seven million, sixty-five thousand, five hundred sixty-six".