665147240844 has 12 divisors (see below), whose sum is σ = 1552010228664. Its totient is φ = 221715746944.

The previous prime is 665147240839. The next prime is 665147240851. The reversal of 665147240844 is 448042741566.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×665147240844² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 27714468357 + ... + 27714468380.

It is an arithmetic number, because the mean of its divisors is an integer number (129334185722).

Almost surely, 2^665147240844 is an apocalyptic number.

It is an amenable number.

665147240844 is an abundant number, since it is smaller than the sum of its proper divisors (886862987820).

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

665147240844 is a wasteful number, since it uses less digits than its factorization.

665147240844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55428936744 (or 55428936742 counting only the distinct ones).

The product of its (nonzero) digits is 5160960, while the sum is 51.

The spelling of 665147240844 in words is "six hundred sixty-five billion, one hundred forty-seven million, two hundred forty thousand, eight hundred forty-four".