660844899 has 80 divisors (see below), whose sum is σ = 1180650240. Its totient is φ = 363061440.

The previous prime is 660844861. The next prime is 660844907. The reversal of 660844899 is 998448066.

It is not a de Polignac number, because 660844899 - 2⁷ = 660844771 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (660844819) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 682914 + ... + 683880.

It is an arithmetic number, because the mean of its divisors is an integer number (14758128).

Almost surely, 2^660844899 is an apocalyptic number.

660844899 is a deficient number, since it is larger than the sum of its proper divisors (519805341).

660844899 is a wasteful number, since it uses less digits than its factorization.

660844899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1062 (or 1053 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 54.

The square root of 660844899 is about 25706.9037225411. The cubic root of 660844899 is about 871.0301353020.

The spelling of 660844899 in words is "six hundred sixty million, eight hundred forty-four thousand, eight hundred ninety-nine".