664581751384 has 32 divisors (see below), whose sum is σ = 1286993797920. Its totient is φ = 321555177216.

The previous prime is 664581751367. The next prime is 664581751387. The reversal of 664581751384 is 483157185466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664581751387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10704732 + ... + 10766635.

It is an arithmetic number, because the mean of its divisors is an integer number (40218556185).

Almost surely, 2^664581751384 is an apocalyptic number.

It is an amenable number.

664581751384 is a deficient number, since it is larger than the sum of its proper divisors (622412046536).

664581751384 is a wasteful number, since it uses less digits than its factorization.

664581751384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21471499 (or 21471495 counting only the distinct ones).

The product of its digits is 19353600, while the sum is 58.

The spelling of 664581751384 in words is "six hundred sixty-four billion, five hundred eighty-one million, seven hundred fifty-one thousand, three hundred eighty-four".