660770409 has 8 divisors (see below), whose sum is σ = 948798592. Its totient is φ = 406627920.

The previous prime is 660770393. The next prime is 660770431. The reversal of 660770409 is 904077066.

660770409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 660770409 - 2⁴ = 660770393 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 16942831 = 660770409 / (6 + 6 + 0 + 7 + 7 + 0 + 4 + 0 + 9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (660770009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8471377 + ... + 8471454.

It is an arithmetic number, because the mean of its divisors is an integer number (118599824).

Almost surely, 2^660770409 is an apocalyptic number.

It is an amenable number.

660770409 is a deficient number, since it is larger than the sum of its proper divisors (288028183).

660770409 is a wasteful number, since it uses less digits than its factorization.

660770409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16942847.

The product of its (nonzero) digits is 63504, while the sum is 39.

The square root of 660770409 is about 25705.4548491171. The cubic root of 660770409 is about 870.9974067587.

The spelling of 660770409 in words is "six hundred sixty million, seven hundred seventy thousand, four hundred nine".