664803455958 has 96 divisors (see below), whose sum is σ = 1526975180640. Its totient is φ = 208665300480.

The previous prime is 664803455957. The next prime is 664803456007. The reversal of 664803455958 is 859554308466.

It is a happy number.

664803455958 is a `hidden beast` number, since 6 + 6 + 4 + 8 + 0 + 34 + 5 + 595 + 8 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 664803455895 and 664803455904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664803455951) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 101292385 + ... + 101298947.

It is an arithmetic number, because the mean of its divisors is an integer number (15905991465).

Almost surely, 2^664803455958 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664803455958, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (763487590320).

664803455958 is an abundant number, since it is smaller than the sum of its proper divisors (862171724682).

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

664803455958 is a wasteful number, since it uses less digits than its factorization.

664803455958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11374 (or 11371 counting only the distinct ones).

The product of its (nonzero) digits is 124416000, while the sum is 63.

The spelling of 664803455958 in words is "six hundred sixty-four billion, eight hundred three million, four hundred fifty-five thousand, nine hundred fifty-eight".