666061665500 has 96 divisors (see below), whose sum is σ = 1813625468928. Its totient is φ = 207603624000.

The previous prime is 666061665463. The next prime is 666061665523. The reversal of 666061665500 is 5566160666.

It is a congruent number.

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, 8611652 + ... + 8688651.

It is an arithmetic number, because the mean of its divisors is an integer number (18891931968).

Almost surely, 2^666061665500 is an apocalyptic number.

It is an amenable number.

666061665500 is an abundant number, since it is smaller than the sum of its proper divisors (1147563803428).

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

666061665500 is a wasteful number, since it uses less digits than its factorization.

666061665500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17300340 (or 17300328 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 47.

It can be divided in two parts, 66606166 and 5500, that added together give a palindrome (66611666).

The spelling of 666061665500 in words is "six hundred sixty-six billion, sixty-one million, six hundred sixty-five thousand, five hundred".