6644432536 has 24 divisors (see below), whose sum is σ = 14492321820. Its totient is φ = 2847613776.

The previous prime is 6644432477. The next prime is 6644432581. The reversal of 6644432536 is 6352344466.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 6644432492 and 6644432501.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8474650 + ... + 8475433.

Almost surely, 2^6644432536 is an apocalyptic number.

It is an amenable number.

6644432536 is an abundant number, since it is smaller than the sum of its proper divisors (7847889284).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6644432536 is a wasteful number, since it uses less digits than its factorization.

6644432536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16950103 (or 16950092 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 43.

The square root of 6644432536 is about 81513.3886916744. The cubic root of 6644432536 is about 1879.9774156031.

The spelling of 6644432536 in words is "six billion, six hundred forty-four million, four hundred thirty-two thousand, five hundred thirty-six".