660661510506 has 16 divisors (see below), whose sum is σ = 1325832659424. Its totient is φ = 219468897104.

The previous prime is 660661510451. The next prime is 660661510517. The reversal of 660661510506 is 605015166066.

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, 187899696 + ... + 187903211.

It is an arithmetic number, because the mean of its divisors is an integer number (82864541214).

Almost surely, 2^660661510506 is an apocalyptic number.

660661510506 is an abundant number, since it is smaller than the sum of its proper divisors (665171148918).

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

660661510506 is a wasteful number, since it uses less digits than its factorization.

660661510506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375803205.

The product of its (nonzero) digits is 194400, while the sum is 42.

The spelling of 660661510506 in words is "six hundred sixty billion, six hundred sixty-one million, five hundred ten thousand, five hundred six".