660740849 has 4 divisors (see below), whose sum is σ = 689468736. Its totient is φ = 632012964.

The previous prime is 660740833. The next prime is 660740863. The reversal of 660740849 is 948047066.

660740849 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 660740849 - 2⁴ = 660740833 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (660740449) 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, 14363909 + ... + 14363954.

It is an arithmetic number, because the mean of its divisors is an integer number (172367184).

Almost surely, 2^660740849 is an apocalyptic number.

It is an amenable number.

660740849 is a deficient number, since it is larger than the sum of its proper divisors (28727887).

660740849 is a wasteful number, since it uses less digits than its factorization.

660740849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28727886.

The product of its (nonzero) digits is 290304, while the sum is 44.

The square root of 660740849 is about 25704.8798674493. The cubic root of 660740849 is about 870.9844183505.

The spelling of 660740849 in words is "six hundred sixty million, seven hundred forty thousand, eight hundred forty-nine".