664499160 has 512 divisors, whose sum is σ = 2612736000. Its totient is φ = 148801536.

The previous prime is 664499149. The next prime is 664499201. The reversal of 664499160 is 61994466.

664499160 is a `hidden beast` number, since 66 + 449 + 91 + 60 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 12537694 + ... + 12537746.

It is an arithmetic number, because the mean of its divisors is an integer number (5103000).

Almost surely, 2^664499160 is an apocalyptic number.

664499160 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 664499160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1306368000).

664499160 is an abundant number, since it is smaller than the sum of its proper divisors (1948236840).

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

664499160 is a wasteful number, since it uses less digits than its factorization.

664499160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152 (or 142 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 45.

The square root of 664499160 is about 25777.8812162676. The cubic root of 664499160 is about 872.6326910995.

The spelling of 664499160 in words is "six hundred sixty-four million, four hundred ninety-nine thousand, one hundred sixty".