6604259561 has 4 divisors (see below), whose sum is σ = 6817300224. Its totient is φ = 6391218900.

The previous prime is 6604259549. The next prime is 6604259579. The reversal of 6604259561 is 1659524066.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1659524066 = 2 ⋅829762033.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6604259561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6604259591) 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, 106520285 + ... + 106520346.

It is an arithmetic number, because the mean of its divisors is an integer number (1704325056).

Almost surely, 2^6604259561 is an apocalyptic number.

It is an amenable number.

6604259561 is a deficient number, since it is larger than the sum of its proper divisors (213040663).

6604259561 is a wasteful number, since it uses less digits than its factorization.

6604259561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213040662.

The product of its (nonzero) digits is 388800, while the sum is 44.

The square root of 6604259561 is about 81266.5956036058. The cubic root of 6604259561 is about 1876.1809033582.

The spelling of 6604259561 in words is "six billion, six hundred four million, two hundred fifty-nine thousand, five hundred sixty-one".