66276865 has 4 divisors (see below), whose sum is σ = 79532244. Its totient is φ = 53021488.

The previous prime is 66276857. The next prime is 66276877. The reversal of 66276865 is 56867266.

66276865 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.

It can be written as a sum of positive squares in 2 ways, for example, as 21641104 + 44635761 = 4652^2 + 6681^2 .

It is a cyclic number.

It is not a de Polignac number, because 66276865 - 2³ = 66276857 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 (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6627682 + ... + 6627691.

It is an arithmetic number, because the mean of its divisors is an integer number (19883061).

Almost surely, 2^66276865 is an apocalyptic number.

It is an amenable number.

66276865 is a deficient number, since it is larger than the sum of its proper divisors (13255379).

66276865 is a wasteful number, since it uses less digits than its factorization.

66276865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13255378.

The product of its digits is 725760, while the sum is 46.

The square root of 66276865 is about 8141.0604346117. The cubic root of 66276865 is about 404.6883035866.

The spelling of 66276865 in words is "sixty-six million, two hundred seventy-six thousand, eight hundred sixty-five".