66307705 has 8 divisors (see below), whose sum is σ = 79619400. Its totient is φ = 53012736.

The previous prime is 66307697. The next prime is 66307723. The reversal of 66307705 is 50770366.

It can be written as a sum of positive squares in 4 ways, for example, as 2499561 + 63808144 = 1581^2 + 7988^2 .

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 66307705 - 2³ = 66307697 is a prime.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 7531 + ... + 13759.

It is an arithmetic number, because the mean of its divisors is an integer number (9952425).

Almost surely, 2^66307705 is an apocalyptic number.

It is an amenable number.

66307705 is a deficient number, since it is larger than the sum of its proper divisors (13311695).

66307705 is a wasteful number, since it uses less digits than its factorization.

66307705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8363.

The product of its (nonzero) digits is 26460, while the sum is 34.

The square root of 66307705 is about 8142.9543164628. The cubic root of 66307705 is about 404.7510638070.

The spelling of 66307705 in words is "sixty-six million, three hundred seven thousand, seven hundred five".