6643252417 has 4 divisors (see below), whose sum is σ = 6647715460. Its totient is φ = 6638789376.

The previous prime is 6643252409. The next prime is 6643252423. The reversal of 6643252417 is 7142523466.

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 2330572176 + 4312680241 = 48276^2 + 65671^2 .

It is a cyclic number.

It is not a de Polignac number, because 6643252417 - 2³ = 6643252409 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 6643252417.

It is not an unprimeable number, because it can be changed into a prime (6643252117) 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, 2229288 + ... + 2232265.

It is an arithmetic number, because the mean of its divisors is an integer number (1661928865).

Almost surely, 2^6643252417 is an apocalyptic number.

It is an amenable number.

6643252417 is a deficient number, since it is larger than the sum of its proper divisors (4463043).

6643252417 is a wasteful number, since it uses less digits than its factorization.

6643252417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4463042.

The product of its digits is 241920, while the sum is 40.

The square root of 6643252417 is about 81506.1495655389. The cubic root of 6643252417 is about 1879.8661079574.

The spelling of 6643252417 in words is "six billion, six hundred forty-three million, two hundred fifty-two thousand, four hundred seventeen".