2545220173 has 4 divisors (see below), whose sum is σ = 2548455040. Its totient is φ = 2541985308.

The previous prime is 2545220159. The next prime is 2545220179. The reversal of 2545220173 is 3710225452.

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 2545220173 - 2¹⁷ = 2545089101 is a prime.

It is a super-2 number, since 2×2545220173² = 12956291458092299858, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2545220179) 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, 1616253 + ... + 1617826.

It is an arithmetic number, because the mean of its divisors is an integer number (637113760).

Almost surely, 2^2545220173 is an apocalyptic number.

It is an amenable number.

2545220173 is a deficient number, since it is larger than the sum of its proper divisors (3234867).

2545220173 is an equidigital number, since it uses as much as digits as its factorization.

2545220173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3234866.

The product of its (nonzero) digits is 16800, while the sum is 31.

The square root of 2545220173 is about 50450.1751533134. The cubic root of 2545220173 is about 1365.3430550135.

The spelling of 2545220173 in words is "two billion, five hundred forty-five million, two hundred twenty thousand, one hundred seventy-three".