660844897 has 4 divisors (see below), whose sum is σ = 663756336. Its totient is φ = 657933460.

The previous prime is 660844861. The next prime is 660844907. The reversal of 660844897 is 798448066.

It is a happy number.

660844897 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 660844897 - 2²³ = 652456289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (660844817) 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, 1455379 + ... + 1455832.

It is an arithmetic number, because the mean of its divisors is an integer number (165939084).

Almost surely, 2^660844897 is an apocalyptic number.

It is an amenable number.

660844897 is a deficient number, since it is larger than the sum of its proper divisors (2911439).

660844897 is a wasteful number, since it uses less digits than its factorization.

660844897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2911438.

The product of its (nonzero) digits is 2322432, while the sum is 52.

The square root of 660844897 is about 25706.9036836411. The cubic root of 660844897 is about 871.0301344233.

The spelling of 660844897 in words is "six hundred sixty million, eight hundred forty-four thousand, eight hundred ninety-seven".