665166567 has 16 divisors (see below), whose sum is σ = 956966528. Its totient is φ = 408538080.

The previous prime is 665166529. The next prime is 665166571. The reversal of 665166567 is 765661566.

It is a happy number.

It is not a de Polignac number, because 665166567 - 2⁸ = 665166311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665166577) 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 15 ways as a sum of consecutive naturals, for example, 4092 + ... + 36702.

It is an arithmetic number, because the mean of its divisors is an integer number (59810408).

Almost surely, 2^665166567 is an apocalyptic number.

665166567 is a deficient number, since it is larger than the sum of its proper divisors (291799961).

665166567 is a wasteful number, since it uses less digits than its factorization.

665166567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33150.

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

The square root of 665166567 is about 25790.8233098519. The cubic root of 665166567 is about 872.9247437847.

The spelling of 665166567 in words is "six hundred sixty-five million, one hundred sixty-six thousand, five hundred sixty-seven".