664687228480 has 84 divisors (see below), whose sum is σ = 1739757122460. Its totient is φ = 241704432640.

The previous prime is 664687228421. The next prime is 664687228549. The reversal of 664687228480 is 84822786466.

It can be written as a sum of positive squares in 2 ways, for example, as 384786977344 + 279900251136 = 620312^2 + 529056^2 .

It is a super-2 number, since 2×664687228480² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8544535 + ... + 8621974.

It is an arithmetic number, because the mean of its divisors is an integer number (20711394315).

Almost surely, 2^664687228480 is an apocalyptic number.

It is an amenable number.

664687228480 is an abundant number, since it is smaller than the sum of its proper divisors (1075069893980).

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

664687228480 is a wasteful number, since it uses less digits than its factorization.

664687228480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17166548 (or 17166527 counting only the distinct ones).

The product of its (nonzero) digits is 49545216, while the sum is 61.

The spelling of 664687228480 in words is "six hundred sixty-four billion, six hundred eighty-seven million, two hundred twenty-eight thousand, four hundred eighty".