664884844680 has 64 divisors (see below), whose sum is σ = 2279605184640. Its totient is φ = 151973678592.

The previous prime is 664884844651. The next prime is 664884844697. The reversal of 664884844680 is 86448488466.

It is a super-3 number, since 3×664884844680³ (a number of 36 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 395763949 + ... + 395765628.

It is an arithmetic number, because the mean of its divisors is an integer number (35618831010).

Almost surely, 2^664884844680 is an apocalyptic number.

664884844680 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

664884844680 is an abundant number, since it is smaller than the sum of its proper divisors (1614720339960).

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

664884844680 is a wasteful number, since it uses less digits than its factorization.

664884844680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 791529598 (or 791529594 counting only the distinct ones).

The product of its (nonzero) digits is 226492416, while the sum is 66.

The spelling of 664884844680 in words is "six hundred sixty-four billion, eight hundred eighty-four million, eight hundred forty-four thousand, six hundred eighty".