6645370855369 has 4 divisors (see below), whose sum is σ = 6647046022144. Its totient is φ = 6643695688596.

The previous prime is 6645370855351. The next prime is 6645370855399. The reversal of 6645370855369 is 9635580735466.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6645370855369 - 2¹¹ = 6645370853321 is a prime.

It is a super-2 number, since 2×6645370855369² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6645370855339) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 837577437 + ... + 837585370.

It is an arithmetic number, because the mean of its divisors is an integer number (1661761505536).

Almost surely, 2^{6645370855369} is an apocalyptic number.

It is an amenable number.

6645370855369 is a deficient number, since it is larger than the sum of its proper divisors (1675166775).

6645370855369 is a wasteful number, since it uses less digits than its factorization.

6645370855369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1675166774.

The product of its (nonzero) digits is 489888000, while the sum is 67.

The spelling of 6645370855369 in words is "six trillion, six hundred forty-five billion, three hundred seventy million, eight hundred fifty-five thousand, three hundred sixty-nine".