66568805 has 4 divisors (see below), whose sum is σ = 79882572. Its totient is φ = 53255040.

The previous prime is 66568793. The next prime is 66568813. The reversal of 66568805 is 50886566.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 47637604 + 18931201 = 6902^2 + 4351^2 .

It is not a de Polignac number, because 66568805 - 2¹² = 66564709 is a prime.

It is a Duffinian number.

It is a congruent 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, 6656876 + ... + 6656885.

It is an arithmetic number, because the mean of its divisors is an integer number (19970643).

Almost surely, 2^66568805 is an apocalyptic number.

It is an amenable number.

66568805 is a deficient number, since it is larger than the sum of its proper divisors (13313767).

66568805 is a wasteful number, since it uses less digits than its factorization.

66568805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13313766.

The product of its (nonzero) digits is 345600, while the sum is 44.

The square root of 66568805 is about 8158.9708297064. The cubic root of 66568805 is about 405.2816310698.

The spelling of 66568805 in words is "sixty-six million, five hundred sixty-eight thousand, eight hundred five".