2558217947 has 4 divisors (see below), whose sum is σ = 2558776176. Its totient is φ = 2557659720.

The previous prime is 2558217923. The next prime is 2558217967. The reversal of 2558217947 is 7497128552.

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

It is a cyclic number.

It is not a de Polignac number, because 2558217947 - 2²⁶ = 2491109083 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2558217895 and 2558217904.

It is not an unprimeable number, because it can be changed into a prime (2558217967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 272183 + ... + 281424.

It is an arithmetic number, because the mean of its divisors is an integer number (639694044).

Almost surely, 2^2558217947 is an apocalyptic number.

2558217947 is a deficient number, since it is larger than the sum of its proper divisors (558229).

2558217947 is an equidigital number, since it uses as much as digits as its factorization.

2558217947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 558228.

The product of its digits is 1411200, while the sum is 50.

The square root of 2558217947 is about 50578.8290394311. The cubic root of 2558217947 is about 1367.6632599329.

The spelling of 2558217947 in words is "two billion, five hundred fifty-eight million, two hundred seventeen thousand, nine hundred forty-seven".