664889850576 has 360 divisors, whose sum is σ = 2271066690048. Its totient is φ = 180823104000.

The previous prime is 664889850551. The next prime is 664889850601. The reversal of 664889850576 is 675058988466.

It is a happy number.

664889850576 is a `hidden beast` number, since 6 + 6 + 48 + 8 + 9 + 8 + 5 + 0 + 576 = 666.

It is an interprime number because it is at equal distance from previous prime (664889850551) and next prime (664889850601).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 13317981 + ... + 13367811.

Almost surely, 2^664889850576 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664889850576, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1135533345024).

664889850576 is an abundant number, since it is smaller than the sum of its proper divisors (1606176839472).

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

664889850576 is a wasteful number, since it uses less digits than its factorization.

664889850576 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49951 (or 49935 counting only the distinct ones).

The product of its (nonzero) digits is 696729600, while the sum is 72.

The spelling of 664889850576 in words is "six hundred sixty-four billion, eight hundred eighty-nine million, eight hundred fifty thousand, five hundred seventy-six".