66516265 has 4 divisors (see below), whose sum is σ = 79819524. Its totient is φ = 53213008.

The previous prime is 66516239. The next prime is 66516271. The reversal of 66516265 is 56261566.

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 30946969 + 35569296 = 5563^2 + 5964^2 .

It is a cyclic number.

It is not a de Polignac number, because 66516265 - 2¹³ = 66508073 is a prime.

It is a Duffinian number.

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 3 ways as a sum of consecutive naturals, for example, 6651622 + ... + 6651631.

It is an arithmetic number, because the mean of its divisors is an integer number (19954881).

Almost surely, 2^66516265 is an apocalyptic number.

It is an amenable number.

66516265 is a deficient number, since it is larger than the sum of its proper divisors (13303259).

66516265 is a wasteful number, since it uses less digits than its factorization.

66516265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13303258.

The product of its digits is 64800, while the sum is 37.

The square root of 66516265 is about 8155.7504253134. The cubic root of 66516265 is about 405.1749790056.

The spelling of 66516265 in words is "sixty-six million, five hundred sixteen thousand, two hundred sixty-five".