666671121500 has 48 divisors (see below), whose sum is σ = 1459641115296. Its totient is φ = 266003360000.

The previous prime is 666671121451. The next prime is 666671121517. The reversal of 666671121500 is 5121176666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1462022 + ... + 1863021.

It is an arithmetic number, because the mean of its divisors is an integer number (30409189902).

Almost surely, 2^666671121500 is an apocalyptic number.

It is an amenable number.

666671121500 is an abundant number, since it is smaller than the sum of its proper divisors (792969993796).

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

666671121500 is a wasteful number, since it uses less digits than its factorization.

666671121500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3325463 (or 3325451 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 41.

The spelling of 666671121500 in words is "six hundred sixty-six billion, six hundred seventy-one million, one hundred twenty-one thousand, five hundred".