6643188922 has 4 divisors (see below), whose sum is σ = 9964783386. Its totient is φ = 3321594460.

The previous prime is 6643188907. The next prime is 6643188931. The reversal of 6643188922 is 2298813466.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 4434094921 + 2209094001 = 66589^2 + 47001^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1660797229 + ... + 1660797232.

Almost surely, 2^6643188922 is an apocalyptic number.

6643188922 is a deficient number, since it is larger than the sum of its proper divisors (3321594464).

6643188922 is a wasteful number, since it uses less digits than its factorization.

6643188922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3321594463.

The product of its digits is 995328, while the sum is 49.

The square root of 6643188922 is about 81505.7600541213. The cubic root of 6643188922 is about 1879.8601187987.

The spelling of 6643188922 in words is "six billion, six hundred forty-three million, one hundred eighty-eight thousand, nine hundred twenty-two".