664581416268 has 48 divisors (see below), whose sum is σ = 1933327759104. Its totient is φ = 172618549440.

The previous prime is 664581416249. The next prime is 664581416281. The reversal of 664581416268 is 862614185466.

It is an unprimeable number.

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, 359621055 + ... + 359622902.

It is an arithmetic number, because the mean of its divisors is an integer number (40277661648).

Almost surely, 2^664581416268 is an apocalyptic number.

It is an amenable number.

664581416268 is an abundant number, since it is smaller than the sum of its proper divisors (1268746342836).

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

664581416268 is a wasteful number, since it uses less digits than its factorization.

664581416268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 719243982 (or 719243980 counting only the distinct ones).

The product of its digits is 13271040, while the sum is 57.

The spelling of 664581416268 in words is "six hundred sixty-four billion, five hundred eighty-one million, four hundred sixteen thousand, two hundred sixty-eight".