6640364550 has 24 divisors (see below), whose sum is σ = 16468104456. Its totient is φ = 1770763840.

The previous prime is 6640364519. The next prime is 6640364561. The reversal of 6640364550 is 554630466.

It is a junction number, because it is equal to n+sod(n) for n = 6640364499 and 6640364508.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 22134399 + ... + 22134698.

It is an arithmetic number, because the mean of its divisors is an integer number (686171019).

Almost surely, 2^6640364550 is an apocalyptic number.

6640364550 is an abundant number, since it is smaller than the sum of its proper divisors (9827739906).

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

6640364550 is a wasteful number, since it uses less digits than its factorization.

6640364550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44269112 (or 44269107 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 39.

The square root of 6640364550 is about 81488.4320011129. The cubic root of 6640364550 is about 1879.5936716168.

The spelling of 6640364550 in words is "six billion, six hundred forty million, three hundred sixty-four thousand, five hundred fifty".