245660409 has 6 divisors (see below), whose sum is σ = 354842826. Its totient is φ = 163773600.

The previous prime is 245660383. The next prime is 245660417. The reversal of 245660409 is 904066542.

245660409 is a `hidden beast` number, since 2 + 45 + 6 + 604 + 0 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 162486009 + 83174400 = 12747^2 + 9120^2 .

It is not a de Polignac number, because 245660409 - 2⁵ = 245660377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (245660209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13647792 + ... + 13647809.

It is an arithmetic number, because the mean of its divisors is an integer number (59140471).

Almost surely, 2^245660409 is an apocalyptic number.

It is an amenable number.

245660409 is a deficient number, since it is larger than the sum of its proper divisors (109182417).

245660409 is a wasteful number, since it uses less digits than its factorization.

245660409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27295607 (or 27295604 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 245660409 is about 15673.5576369885. The cubic root of 245660409 is about 626.2942005687.

The spelling of 245660409 in words is "two hundred forty-five million, six hundred sixty thousand, four hundred nine".