65580681266 has 4 divisors (see below), whose sum is σ = 98371021902. Its totient is φ = 32790340632.

The previous prime is 65580681253. The next prime is 65580681277. The reversal of 65580681266 is 66218608556.

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

It can be written as a sum of positive squares in only one way, i.e., 64933742041 + 646939225 = 254821^2 + 25435^2 .

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 as a sum of consecutive naturals, namely, 16395170315 + ... + 16395170318.

Almost surely, 2^65580681266 is an apocalyptic number.

65580681266 is a deficient number, since it is larger than the sum of its proper divisors (32790340636).

65580681266 is a wasteful number, since it uses less digits than its factorization.

65580681266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32790340635.

The product of its (nonzero) digits is 4147200, while the sum is 53.

The spelling of 65580681266 in words is "sixty-five billion, five hundred eighty million, six hundred eighty-one thousand, two hundred sixty-six".