660678049 has 4 divisors (see below), whose sum is σ = 660992836. Its totient is φ = 660363264.

The previous prime is 660678041. The next prime is 660678071. The reversal of 660678049 is 940876066.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 54287424 + 606390625 = 7368^2 + 24625^2 .

It is a cyclic number.

It is not a de Polignac number, because 660678049 - 2³ = 660678041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (660678041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 154224 + ... + 158449.

It is an arithmetic number, because the mean of its divisors is an integer number (165248209).

Almost surely, 2^660678049 is an apocalyptic number.

It is an amenable number.

660678049 is a deficient number, since it is larger than the sum of its proper divisors (314787).

660678049 is a wasteful number, since it uses less digits than its factorization.

660678049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314786.

The product of its (nonzero) digits is 435456, while the sum is 46.

The square root of 660678049 is about 25703.6582804861. The cubic root of 660678049 is about 870.9568232883.

The spelling of 660678049 in words is "six hundred sixty million, six hundred seventy-eight thousand, forty-nine".