2225555561 has 4 divisors (see below), whose sum is σ = 2356470612. Its totient is φ = 2094640512.

The previous prime is 2225555551. The next prime is 2225555567. The reversal of 2225555561 is 1655555222.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1038063961 + 1187491600 = 32219^2 + 34460^2 .

It is a cyclic number.

It is not a de Polignac number, because 2225555561 - 2¹⁰ = 2225554537 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2225555567) 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, 65457500 + ... + 65457533.

It is an arithmetic number, because the mean of its divisors is an integer number (589117653).

Almost surely, 2^2225555561 is an apocalyptic number.

It is an amenable number.

2225555561 is a deficient number, since it is larger than the sum of its proper divisors (130915051).

2225555561 is a wasteful number, since it uses less digits than its factorization.

2225555561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130915050.

The product of its digits is 150000, while the sum is 38.

The square root of 2225555561 is about 47175.7942275485. The cubic root of 2225555561 is about 1305.6080334271.

The spelling of 2225555561 in words is "two billion, two hundred twenty-five million, five hundred fifty-five thousand, five hundred sixty-one".