66705667 has 8 divisors (see below), whose sum is σ = 76553312. Its totient is φ = 56937600.

The previous prime is 66705659. The next prime is 66705673. The reversal of 66705667 is 76650766.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66705667 - 2³ = 66705659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66705677) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18084 + ... + 21457.

It is an arithmetic number, because the mean of its divisors is an integer number (9569164).

Almost surely, 2^66705667 is an apocalyptic number.

66705667 is a deficient number, since it is larger than the sum of its proper divisors (9847645).

66705667 is a wasteful number, since it uses less digits than its factorization.

66705667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39789.

The product of its (nonzero) digits is 317520, while the sum is 43.

The square root of 66705667 is about 8167.3537330031. The cubic root of 66705667 is about 405.5591869263.

The spelling of 66705667 in words is "sixty-six million, seven hundred five thousand, six hundred sixty-seven".