664510212 has 36 divisors (see below), whose sum is σ = 1778543676. Its totient is φ = 208473600.

The previous prime is 664510183. The next prime is 664510219. The reversal of 664510212 is 212015466.

664510212 is a `hidden beast` number, since 6 + 645 + 1 + 0 + 2 + 12 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 450882756 + 213627456 = 21234^2 + 14616^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (664510219) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 542289 + ... + 543512.

It is an arithmetic number, because the mean of its divisors is an integer number (49403991).

Almost surely, 2^664510212 is an apocalyptic number.

It is an amenable number.

664510212 is an abundant number, since it is smaller than the sum of its proper divisors (1114033464).

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

664510212 is a wasteful number, since it uses less digits than its factorization.

664510212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1085828 (or 1085823 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 664510212 is about 25778.0955852057. The cubic root of 664510212 is about 872.6375289702.

Adding to 664510212 its reverse (212015466), we get a palindrome (876525678).

The spelling of 664510212 in words is "six hundred sixty-four million, five hundred ten thousand, two hundred twelve".