660216566801 has 16 divisors (see below), whose sum is σ = 723427511040. Its totient is φ = 597538216320.

The previous prime is 660216566773. The next prime is 660216566833. The reversal of 660216566801 is 108665612066.

It is a cyclic number.

It is not a de Polignac number, because 660216566801 - 2³⁸ = 385338659857 is a prime.

It is a super-3 number, since 3×660216566801³ (a number of 36 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (660216566101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25794056 + ... + 25819638.

It is an arithmetic number, because the mean of its divisors is an integer number (45214219440).

Almost surely, 2^660216566801 is an apocalyptic number.

It is an amenable number.

660216566801 is a deficient number, since it is larger than the sum of its proper divisors (63210944239).

660216566801 is a wasteful number, since it uses less digits than its factorization.

660216566801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35896.

The product of its (nonzero) digits is 622080, while the sum is 47.

The spelling of 660216566801 in words is "six hundred sixty billion, two hundred sixteen million, five hundred sixty-six thousand, eight hundred one".