660556166505 has 32 divisors (see below), whose sum is σ = 1122883948800. Its totient is φ = 330955252992.

The previous prime is 660556166461. The next prime is 660556166527. The reversal of 660556166505 is 505661655066.

It is not a de Polignac number, because 660556166505 - 2⁶ = 660556166441 is a prime.

It is a Curzon 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, 20504445 + ... + 20536634.

It is an arithmetic number, because the mean of its divisors is an integer number (35090123400).

Almost surely, 2^660556166505 is an apocalyptic number.

It is an amenable number.

660556166505 is a deficient number, since it is larger than the sum of its proper divisors (462327782295).

660556166505 is a wasteful number, since it uses less digits than its factorization.

660556166505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41041153.

The product of its (nonzero) digits is 4860000, while the sum is 51.

The spelling of 660556166505 in words is "six hundred sixty billion, five hundred fifty-six million, one hundred sixty-six thousand, five hundred five".