666481504 has 24 divisors (see below), whose sum is σ = 1413069840. Its totient is φ = 307606656.

The previous prime is 666481489. The next prime is 666481513. The reversal of 666481504 is 405184666.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 800644 + ... + 801475.

It is an arithmetic number, because the mean of its divisors is an integer number (58877910).

Almost surely, 2^666481504 is an apocalyptic number.

It is an amenable number.

666481504 is an abundant number, since it is smaller than the sum of its proper divisors (746588336).

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

666481504 is a wasteful number, since it uses less digits than its factorization.

666481504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1602142 (or 1602134 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 40.

The square root of 666481504 is about 25816.3030660860. The cubic root of 666481504 is about 873.4995800032.

The spelling of 666481504 in words is "six hundred sixty-six million, four hundred eighty-one thousand, five hundred four".