660044749 has 24 divisors (see below), whose sum is σ = 829090080. Its totient is φ = 520831584.

The previous prime is 660044719. The next prime is 660044767. The reversal of 660044749 is 947440066.

It is not a de Polignac number, because 660044749 - 2¹¹ = 660042701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660044719) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 281022 + ... + 283360.

It is an arithmetic number, because the mean of its divisors is an integer number (34545420).

Almost surely, 2^660044749 is an apocalyptic number.

It is an amenable number.

660044749 is a deficient number, since it is larger than the sum of its proper divisors (169045331).

660044749 is a wasteful number, since it uses less digits than its factorization.

660044749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2809 (or 2802 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 40.

The square root of 660044749 is about 25691.3360687995. The cubic root of 660044749 is about 870.6784460006.

The spelling of 660044749 in words is "six hundred sixty million, forty-four thousand, seven hundred forty-nine".