666005661500 has 48 divisors (see below), whose sum is σ = 1454639886336. Its totient is φ = 266386968000.

The previous prime is 666005661457. The next prime is 666005661553. The reversal of 666005661500 is 5166500666.

666005661500 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 15 ways as a sum of consecutive naturals, for example, 13385669 + ... + 13435331.

It is an arithmetic number, because the mean of its divisors is an integer number (30304997632).

Almost surely, 2^666005661500 is an apocalyptic number.

It is an amenable number.

666005661500 is an abundant number, since it is smaller than the sum of its proper divisors (788634224836).

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

666005661500 is a wasteful number, since it uses less digits than its factorization.

666005661500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76503 (or 76491 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 41.

The spelling of 666005661500 in words is "six hundred sixty-six billion, five million, six hundred sixty-one thousand, five hundred".