665556332089 has 16 divisors (see below), whose sum is σ = 734564597760. Its totient is φ = 598004303760.

The previous prime is 665556332047. The next prime is 665556332099. The reversal of 665556332089 is 980233655566.

It is a cyclic number.

It is not a de Polignac number, because 665556332089 - 2¹⁵ = 665556299321 is a prime.

It is a super-2 number, since 2×665556332089² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665556332099) 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, 635017 + ... + 1316950.

It is an arithmetic number, because the mean of its divisors is an integer number (45910287360).

Almost surely, 2^665556332089 is an apocalyptic number.

It is an amenable number.

665556332089 is a deficient number, since it is larger than the sum of its proper divisors (69008265671).

665556332089 is a wasteful number, since it uses less digits than its factorization.

665556332089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1952340.

The product of its (nonzero) digits is 34992000, while the sum is 58.

The spelling of 665556332089 in words is "six hundred sixty-five billion, five hundred fifty-six million, three hundred thirty-two thousand, eighty-nine".