66704705 has 4 divisors (see below), whose sum is σ = 80045652. Its totient is φ = 53363760.

The previous prime is 66704689. The next prime is 66704749. The reversal of 66704705 is 50740766.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50740766 = 2 ⋅25370383.

It can be written as a sum of positive squares in 2 ways, for example, as 21169201 + 45535504 = 4601^2 + 6748^2 .

It is not a de Polignac number, because 66704705 - 2⁴ = 66704689 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6670466 + ... + 6670475.

It is an arithmetic number, because the mean of its divisors is an integer number (20011413).

Almost surely, 2^66704705 is an apocalyptic number.

It is an amenable number.

66704705 is a deficient number, since it is larger than the sum of its proper divisors (13340947).

66704705 is a wasteful number, since it uses less digits than its factorization.

66704705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13340946.

The product of its (nonzero) digits is 35280, while the sum is 35.

The square root of 66704705 is about 8167.2948397863. The cubic root of 66704705 is about 405.5572373178.

The spelling of 66704705 in words is "sixty-six million, seven hundred four thousand, seven hundred five".