668911500 has 96 divisors (see below), whose sum is σ = 2164344000. Its totient is φ = 178372800.

The previous prime is 668911499. The next prime is 668911513. The reversal of 668911500 is 5119866.

668911500 is a `hidden beast` number, since 6 + 68 + 91 + 1 + 500 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 11275 + ... + 38274.

It is an arithmetic number, because the mean of its divisors is an integer number (22545250).

Almost surely, 2^668911500 is an apocalyptic number.

668911500 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

668911500 is an abundant number, since it is smaller than the sum of its proper divisors (1495432500).

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

668911500 is a wasteful number, since it uses less digits than its factorization.

668911500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49577 (or 49559 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 668911500 is about 25863.3234523330. The cubic root of 668911500 is about 874.5598875104.

The spelling of 668911500 in words is "six hundred sixty-eight million, nine hundred eleven thousand, five hundred".