664505325044 has 96 divisors (see below), whose sum is σ = 1427923002240. Its totient is φ = 266651136000.

The previous prime is 664505325041. The next prime is 664505325049. The reversal of 664505325044 is 440523505466.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 664505324986 and 664505325004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664505325041) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 1203944 + ... + 1666880.

It is an arithmetic number, because the mean of its divisors is an integer number (14874197940).

Almost surely, 2^664505325044 is an apocalyptic number.

It is an amenable number.

664505325044 is an abundant number, since it is smaller than the sum of its proper divisors (763417677196).

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

664505325044 is a wasteful number, since it uses less digits than its factorization.

664505325044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463089 (or 463087 counting only the distinct ones).

The product of its (nonzero) digits is 1728000, while the sum is 44.

The spelling of 664505325044 in words is "six hundred sixty-four billion, five hundred five million, three hundred twenty-five thousand, forty-four".