66069505 has 4 divisors (see below), whose sum is σ = 79283412. Its totient is φ = 52855600.

The previous prime is 66069499. The next prime is 66069541. The reversal of 66069505 is 50596066.

It is a happy number.

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 52475536 + 13593969 = 7244^2 + 3687^2 .

It is a de Polignac number, because none of the positive numbers 2^k-66069505 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, 6606946 + ... + 6606955.

It is an arithmetic number, because the mean of its divisors is an integer number (19820853).

Almost surely, 2^66069505 is an apocalyptic number.

It is an amenable number.

66069505 is a deficient number, since it is larger than the sum of its proper divisors (13213907).

66069505 is a wasteful number, since it uses less digits than its factorization.

66069505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13213906.

The product of its (nonzero) digits is 48600, while the sum is 37.

The square root of 66069505 is about 8128.3150160411. The cubic root of 66069505 is about 404.2658141048.

The spelling of 66069505 in words is "sixty-six million, sixty-nine thousand, five hundred five".