2578617361 has 4 divisors (see below), whose sum is σ = 2622322800. Its totient is φ = 2534911924.

The previous prime is 2578617343. The next prime is 2578617367. The reversal of 2578617361 is 1637168752.

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 2578617361 - 2⁷ = 2578617233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2578617367) 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, 21852631 + ... + 21852748.

It is an arithmetic number, because the mean of its divisors is an integer number (655580700).

Almost surely, 2^2578617361 is an apocalyptic number.

It is an amenable number.

2578617361 is a deficient number, since it is larger than the sum of its proper divisors (43705439).

2578617361 is an equidigital number, since it uses as much as digits as its factorization.

2578617361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43705438.

The product of its digits is 423360, while the sum is 46.

The square root of 2578617361 is about 50780.0882334799. The cubic root of 2578617361 is about 1371.2889215973.

The spelling of 2578617361 in words is "two billion, five hundred seventy-eight million, six hundred seventeen thousand, three hundred sixty-one".