665220868807 has 8 divisors (see below), whose sum is σ = 725719372560. Its totient is φ = 604726344960.

The previous prime is 665220868789. The next prime is 665220868817. The reversal of 665220868807 is 708868022566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 665220868807 - 2¹¹ = 665220866759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665220868817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 639978 + ... + 1319095.

It is an arithmetic number, because the mean of its divisors is an integer number (90714921570).

Almost surely, 2^665220868807 is an apocalyptic number.

665220868807 is a deficient number, since it is larger than the sum of its proper divisors (60498503753).

665220868807 is a wasteful number, since it uses less digits than its factorization.

665220868807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1989953.

The product of its (nonzero) digits is 15482880, while the sum is 58.

The spelling of 665220868807 in words is "six hundred sixty-five billion, two hundred twenty million, eight hundred sixty-eight thousand, eight hundred seven".