666705567 has 16 divisors (see below), whose sum is σ = 970889472. Its totient is φ = 403590720.

The previous prime is 666705547. The next prime is 666705581. The reversal of 666705567 is 765507666.

It is not a de Polignac number, because 666705567 - 2⁶ = 666705503 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666705517) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17883 + ... + 40659.

It is an arithmetic number, because the mean of its divisors is an integer number (60680592).

Almost surely, 2^666705567 is an apocalyptic number.

666705567 is a deficient number, since it is larger than the sum of its proper divisors (304183905).

666705567 is a wasteful number, since it uses less digits than its factorization.

666705567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23678.

The product of its (nonzero) digits is 1587600, while the sum is 48.

The square root of 666705567 is about 25820.6422654434. The cubic root of 666705567 is about 873.5974556915.

The spelling of 666705567 in words is "six hundred sixty-six million, seven hundred five thousand, five hundred sixty-seven".