664454323500 has 96 divisors (see below), whose sum is σ = 2110790223360. Its totient is φ = 161079832000.

The previous prime is 664454323493. The next prime is 664454323517. The reversal of 664454323500 is 5323454466.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20118480 + ... + 20151479.

It is an arithmetic number, because the mean of its divisors is an integer number (21987398160).

Almost surely, 2^664454323500 is an apocalyptic number.

664454323500 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

664454323500 is an abundant number, since it is smaller than the sum of its proper divisors (1446335899860).

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

664454323500 is a wasteful number, since it uses less digits than its factorization.

664454323500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40269992 (or 40269980 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 42.

Adding to 664454323500 its reverse (5323454466), we get a palindrome (669777777966).

The spelling of 664454323500 in words is "six hundred sixty-four billion, four hundred fifty-four million, three hundred twenty-three thousand, five hundred".