666981500 has 24 divisors (see below), whose sum is σ = 1456688688. Its totient is φ = 266792400.

The previous prime is 666981479. The next prime is 666981517. The reversal of 666981500 is 5189666.

666981500 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 666482 + ... + 667481.

It is an arithmetic number, because the mean of its divisors is an integer number (60695362).

Almost surely, 2^666981500 is an apocalyptic number.

It is an amenable number.

666981500 is an abundant number, since it is smaller than the sum of its proper divisors (789707188).

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

666981500 is a wasteful number, since it uses less digits than its factorization.

666981500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1333982 (or 1333970 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 666981500 is about 25825.9849763760. The cubic root of 666981500 is about 873.7179592195.

The spelling of 666981500 in words is "six hundred sixty-six million, nine hundred eighty-one thousand, five hundred".