664709444210 has 32 divisors (see below), whose sum is σ = 1439370829440. Its totient is φ = 215905623552.

The previous prime is 664709444171. The next prime is 664709444219. The reversal of 664709444210 is 12444907466.

It is not an unprimeable number, because it can be changed into a prime (664709444219) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 249889439 + ... + 249892098.

It is an arithmetic number, because the mean of its divisors is an integer number (44980338420).

Almost surely, 2^664709444210 is an apocalyptic number.

664709444210 is an abundant number, since it is smaller than the sum of its proper divisors (774661385230).

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

664709444210 is a wasteful number, since it uses less digits than its factorization.

664709444210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499781570.

The product of its (nonzero) digits is 1161216, while the sum is 47.

The spelling of 664709444210 in words is "six hundred sixty-four billion, seven hundred nine million, four hundred forty-four thousand, two hundred ten".