664265285580 has 432 divisors, whose sum is σ = 2152783422720. Its totient is φ = 152547452928.

The previous prime is 664265285569. The next prime is 664265285597. The reversal of 664265285580 is 85582562466.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a self number, because there is not a number n which added to its sum of digits gives 664265285580.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 1026684817 + ... + 1026685463.

It is an arithmetic number, because the mean of its divisors is an integer number (4983294960).

Almost surely, 2^664265285580 is an apocalyptic number.

664265285580 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664265285580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1076391711360).

664265285580 is an abundant number, since it is smaller than the sum of its proper divisors (1488518137140).

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

664265285580 is a wasteful number, since it uses less digits than its factorization.

664265285580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 850 (or 762 counting only the distinct ones).

The product of its (nonzero) digits is 27648000, while the sum is 57.

The spelling of 664265285580 in words is "six hundred sixty-four billion, two hundred sixty-five million, two hundred eighty-five thousand, five hundred eighty".