6663622505 has 4 divisors (see below), whose sum is σ = 7996347012. Its totient is φ = 5330898000.

The previous prime is 6663622423. The next prime is 6663622517. The reversal of 6663622505 is 5052263666.

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 3781758016 + 2881864489 = 61496^2 + 53683^2 .

It is not a de Polignac number, because 6663622505 - 2³² = 2368655209 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 666362246 + ... + 666362255.

It is an arithmetic number, because the mean of its divisors is an integer number (1999086753).

Almost surely, 2^6663622505 is an apocalyptic number.

It is an amenable number.

6663622505 is a deficient number, since it is larger than the sum of its proper divisors (1332724507).

6663622505 is a wasteful number, since it uses less digits than its factorization.

6663622505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1332724506.

The product of its (nonzero) digits is 388800, while the sum is 41.

The square root of 6663622505 is about 81631.0143572895. The cubic root of 6663622505 is about 1881.7855475679.

The spelling of 6663622505 in words is "six billion, six hundred sixty-three million, six hundred twenty-two thousand, five hundred five".