664435327071740 has 192 divisors, whose sum is σ = 1762360497451008. Its totient is φ = 205025549414400.

The previous prime is 664435327071739. The next prime is 664435327071773. The reversal of 664435327071740 is 47170723534466.

It is a self number, because there is not a number n which added to its sum of digits gives 664435327071740.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 190463570 + ... + 193920710.

It is an arithmetic number, because the mean of its divisors is an integer number (9178960924224).

Almost surely, 2^{664435327071740} 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 664435327071740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (881180248725504).

664435327071740 is an abundant number, since it is smaller than the sum of its proper divisors (1097925170379268).

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

664435327071740 is a wasteful number, since it uses less digits than its factorization.

664435327071740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3460708 (or 3460706 counting only the distinct ones).

The product of its (nonzero) digits is 71124480, while the sum is 59.

The spelling of 664435327071740 in words is "six hundred sixty-four trillion, four hundred thirty-five billion, three hundred twenty-seven million, seventy-one thousand, seven hundred forty".