6645924517 has 8 divisors (see below), whose sum is σ = 6713351424. Its totient is φ = 6578553648.

The previous prime is 6645924499. The next prime is 6645924521. The reversal of 6645924517 is 7154295466.

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 6645924517 - 2²³ = 6637535909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6645924587) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 249243 + ... + 274615.

It is an arithmetic number, because the mean of its divisors is an integer number (839168928).

Almost surely, 2^6645924517 is an apocalyptic number.

It is an amenable number.

6645924517 is a deficient number, since it is larger than the sum of its proper divisors (67426907).

6645924517 is a wasteful number, since it uses less digits than its factorization.

6645924517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28019.

The product of its digits is 1814400, while the sum is 49.

The square root of 6645924517 is about 81522.5399322175. The cubic root of 6645924517 is about 1880.1181188989.

The spelling of 6645924517 in words is "six billion, six hundred forty-five million, nine hundred twenty-four thousand, five hundred seventeen".