6645880617 has 4 divisors (see below), whose sum is σ = 8861174160. Its totient is φ = 4430587076.

The previous prime is 6645880597. The next prime is 6645880621. The reversal of 6645880617 is 7160885466.

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 6645880617 - 2⁷ = 6645880489 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6645880617.

It is not an unprimeable number, because it can be changed into a prime (6645880627) 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, 1107646767 + ... + 1107646772.

It is an arithmetic number, because the mean of its divisors is an integer number (2215293540).

Almost surely, 2^6645880617 is an apocalyptic number.

It is an amenable number.

6645880617 is a deficient number, since it is larger than the sum of its proper divisors (2215293543).

6645880617 is a wasteful number, since it uses less digits than its factorization.

6645880617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2215293542.

The product of its (nonzero) digits is 1935360, while the sum is 51.

The square root of 6645880617 is about 81522.2706810844. The cubic root of 6645880617 is about 1880.1139791504.

The spelling of 6645880617 in words is "six billion, six hundred forty-five million, eight hundred eighty thousand, six hundred seventeen".