665666880751088 has 40 divisors (see below), whose sum is σ = 1292937399277200. Its totient is φ = 332006455599104.

The previous prime is 665666880751069. The next prime is 665666880751231. The reversal of 665666880751088 is 880157088666566.

It is a happy number.

It is a super-2 number, since 2×665666880751088² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13531043 + ... + 38915586.

It is an arithmetic number, because the mean of its divisors is an integer number (32323434981930).

Almost surely, 2^{665666880751088} is an apocalyptic number.

It is an amenable number.

665666880751088 is a deficient number, since it is larger than the sum of its proper divisors (627270518526112).

665666880751088 is a wasteful number, since it uses less digits than its factorization.

665666880751088 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52448609 (or 52448603 counting only the distinct ones).

The product of its (nonzero) digits is 5573836800, while the sum is 80.

The spelling of 665666880751088 in words is "six hundred sixty-five trillion, six hundred sixty-six billion, eight hundred eighty million, seven hundred fifty-one thousand, eighty-eight".