66272761865 has 8 divisors (see below), whose sum is σ = 79572078600. Its totient is φ = 52988366592.

The previous prime is 66272761813. The next prime is 66272761939. The reversal of 66272761865 is 56816727266.

It can be written as a sum of positive squares in 4 ways, for example, as 1581891529 + 64690870336 = 39773^2 + 254344^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66272761865 - 2⁸ = 66272761609 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 66272761865.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3720590 + ... + 3738359.

It is an arithmetic number, because the mean of its divisors is an integer number (9946509825).

Almost surely, 2^66272761865 is an apocalyptic number.

It is an amenable number.

66272761865 is a deficient number, since it is larger than the sum of its proper divisors (13299316735).

66272761865 is a wasteful number, since it uses less digits than its factorization.

66272761865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7460731.

The product of its digits is 10160640, while the sum is 56.

The spelling of 66272761865 in words is "sixty-six billion, two hundred seventy-two million, seven hundred sixty-one thousand, eight hundred sixty-five".