66351265 has 4 divisors (see below), whose sum is σ = 79621524. Its totient is φ = 53081008.

The previous prime is 66351247. The next prime is 66351281. The reversal of 66351265 is 56215366.

66351265 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56215366 = 2 ⋅28107683.

It can be written as a sum of positive squares in 2 ways, for example, as 27625536 + 38725729 = 5256^2 + 6223^2 .

It is a cyclic number.

It is not a de Polignac number, because 66351265 - 2⁷ = 66351137 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66351265.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6635122 + ... + 6635131.

It is an arithmetic number, because the mean of its divisors is an integer number (19905381).

Almost surely, 2^66351265 is an apocalyptic number.

It is an amenable number.

66351265 is a deficient number, since it is larger than the sum of its proper divisors (13270259).

66351265 is a wasteful number, since it uses less digits than its factorization.

66351265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13270258.

The product of its digits is 32400, while the sum is 34.

The square root of 66351265 is about 8145.6285822520. The cubic root of 66351265 is about 404.8396764196.

The spelling of 66351265 in words is "sixty-six million, three hundred fifty-one thousand, two hundred sixty-five".