665155528646 has 32 divisors (see below), whose sum is σ = 1146935946240. Its totient is φ = 283400156736.

The previous prime is 665155528633. The next prime is 665155528649. The reversal of 665155528646 is 646825551566.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665155528649) 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, 10174355 + ... + 10239521.

It is an arithmetic number, because the mean of its divisors is an integer number (35841748320).

Almost surely, 2^665155528646 is an apocalyptic number.

665155528646 is a deficient number, since it is larger than the sum of its proper divisors (481780417594).

665155528646 is a wasteful number, since it uses less digits than its factorization.

665155528646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69428.

The product of its digits is 51840000, while the sum is 59.

The spelling of 665155528646 in words is "six hundred sixty-five billion, one hundred fifty-five million, five hundred twenty-eight thousand, six hundred forty-six".