665144120607 has 4 divisors (see below), whose sum is σ = 886858827480. Its totient is φ = 443429413736.

The previous prime is 665144120591. The next prime is 665144120647. The reversal of 665144120607 is 706021441566.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 665144120607 - 2⁴ = 665144120591 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665144120647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110857353432 + ... + 110857353437.

It is an arithmetic number, because the mean of its divisors is an integer number (221714706870).

Almost surely, 2^665144120607 is an apocalyptic number.

665144120607 is a deficient number, since it is larger than the sum of its proper divisors (221714706873).

665144120607 is a wasteful number, since it uses less digits than its factorization.

665144120607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221714706872.

The product of its (nonzero) digits is 241920, while the sum is 42.

The spelling of 665144120607 in words is "six hundred sixty-five billion, one hundred forty-four million, one hundred twenty thousand, six hundred seven".