2555621569 has 4 divisors (see below), whose sum is σ = 2609996544. Its totient is φ = 2501246596.

The previous prime is 2555621531. The next prime is 2555621689. The reversal of 2555621569 is 9651265552.

It is a happy number.

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 2555621569 - 2²⁷ = 2421403841 is a prime.

It is a super-2 number, since 2×2555621569² = 13062403207876043522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2555621069) 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, 27187417 + ... + 27187510.

It is an arithmetic number, because the mean of its divisors is an integer number (652499136).

Almost surely, 2^2555621569 is an apocalyptic number.

It is an amenable number.

2555621569 is a deficient number, since it is larger than the sum of its proper divisors (54374975).

2555621569 is an equidigital number, since it uses as much as digits as its factorization.

2555621569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54374974.

The product of its digits is 810000, while the sum is 46.

The square root of 2555621569 is about 50553.1558757710. The cubic root of 2555621569 is about 1367.2004152412.

The spelling of 2555621569 in words is "two billion, five hundred fifty-five million, six hundred twenty-one thousand, five hundred sixty-nine".