6645117469 has 4 divisors (see below), whose sum is σ = 6729232960. Its totient is φ = 6561001980.

The previous prime is 6645117439. The next prime is 6645117487. The reversal of 6645117469 is 9647115466.

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 a de Polignac number, because none of the positive numbers 2^k-6645117469 is a prime.

It is a super-2 number, since 2×6645117469² = 88315172353617931922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6645117439) 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, 42057627 + ... + 42057784.

It is an arithmetic number, because the mean of its divisors is an integer number (1682308240).

Almost surely, 2^6645117469 is an apocalyptic number.

It is an amenable number.

6645117469 is a deficient number, since it is larger than the sum of its proper divisors (84115491).

6645117469 is an equidigital number, since it uses as much as digits as its factorization.

6645117469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84115490.

The product of its digits is 1088640, while the sum is 49.

The square root of 6645117469 is about 81517.5899361604. The cubic root of 6645117469 is about 1880.0420117555.

The spelling of 6645117469 in words is "six billion, six hundred forty-five million, one hundred seventeen thousand, four hundred sixty-nine".