664195159689 has 4 divisors (see below), whose sum is σ = 885593546256. Its totient is φ = 442796773124.

The previous prime is 664195159673. The next prime is 664195159717. The reversal of 664195159689 is 986951591466.

664195159689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 664195159689 - 2⁴ = 664195159673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (664195151689) 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, 110699193279 + ... + 110699193284.

It is an arithmetic number, because the mean of its divisors is an integer number (221398386564).

Almost surely, 2^664195159689 is an apocalyptic number.

It is an amenable number.

664195159689 is a deficient number, since it is larger than the sum of its proper divisors (221398386567).

664195159689 is a wasteful number, since it uses less digits than its factorization.

664195159689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221398386566.

The product of its digits is 125971200, while the sum is 69.

The spelling of 664195159689 in words is "six hundred sixty-four billion, one hundred ninety-five million, one hundred fifty-nine thousand, six hundred eighty-nine".