6366855470665 has 4 divisors (see below), whose sum is σ = 7640226564804. Its totient is φ = 5093484376528.

The previous prime is 6366855470653. The next prime is 6366855470681. The reversal of 6366855470665 is 5660745586636.

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 4244799004681 + 2122056465984 = 2060291^2 + 1456728^2 .

It is a cyclic number.

It is not a de Polignac number, because 6366855470665 - 2¹⁹ = 6366854946377 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 6366855470665.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 636685547062 + ... + 636685547071.

It is an arithmetic number, because the mean of its divisors is an integer number (1910056641201).

Almost surely, 2^{6366855470665} is an apocalyptic number.

It is an amenable number.

6366855470665 is a deficient number, since it is larger than the sum of its proper divisors (1273371094139).

6366855470665 is a wasteful number, since it uses less digits than its factorization.

6366855470665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1273371094138.

The product of its (nonzero) digits is 653184000, while the sum is 67.

The spelling of 6366855470665 in words is "six trillion, three hundred sixty-six billion, eight hundred fifty-five million, four hundred seventy thousand, six hundred sixty-five".