665676655660 has 24 divisors (see below), whose sum is σ = 1420837716816. Its totient is φ = 261905568960.

The previous prime is 665676655619. The next prime is 665676655663. The reversal of 665676655660 is 66556676566.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 665676655592 and 665676655601.

It is not an unprimeable number, because it can be changed into a prime (665676655663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 272817082 + ... + 272819521.

It is an arithmetic number, because the mean of its divisors is an integer number (59201571534).

Almost surely, 2^665676655660 is an apocalyptic number.

It is an amenable number.

665676655660 is an abundant number, since it is smaller than the sum of its proper divisors (755161061156).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665676655660 is a wasteful number, since it uses less digits than its factorization.

665676655660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 545636673 (or 545636671 counting only the distinct ones).

The product of its (nonzero) digits is 244944000, while the sum is 64.

The spelling of 665676655660 in words is "six hundred sixty-five billion, six hundred seventy-six million, six hundred fifty-five thousand, six hundred sixty".