6623633661 has 4 divisors (see below), whose sum is σ = 8831511552. Its totient is φ = 4415755772.

The previous prime is 6623633591. The next prime is 6623633677. The reversal of 6623633661 is 1663363266.

6623633661 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 6623633661 - 2¹³ = 6623625469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6623633161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1103938941 + ... + 1103938946.

It is an arithmetic number, because the mean of its divisors is an integer number (2207877888).

Almost surely, 2^6623633661 is an apocalyptic number.

It is an amenable number.

6623633661 is a deficient number, since it is larger than the sum of its proper divisors (2207877891).

6623633661 is a wasteful number, since it uses less digits than its factorization.

6623633661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2207877890.

The product of its digits is 419904, while the sum is 42.

The square root of 6623633661 is about 81385.7091939365. The cubic root of 6623633661 is about 1878.0137522654.

The spelling of 6623633661 in words is "six billion, six hundred twenty-three million, six hundred thirty-three thousand, six hundred sixty-one".