2545663321 has 2 divisors, whose sum is σ = 2545663322. Its totient is φ = 2545663320.

The previous prime is 2545663319. The next prime is 2545663327. The reversal of 2545663321 is 1233665452.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2186030025 + 359633296 = 46755^2 + 18964^2 .

It is a cyclic number.

It is not a de Polignac number, because 2545663321 - 2¹ = 2545663319 is a prime.

Together with 2545663319, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2545663327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1272831660 + 1272831661.

It is an arithmetic number, because the mean of its divisors is an integer number (1272831661).

Almost surely, 2^2545663321 is an apocalyptic number.

It is an amenable number.

2545663321 is a deficient number, since it is larger than the sum of its proper divisors (1).

2545663321 is an equidigital number, since it uses as much as digits as its factorization.

2545663321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129600, while the sum is 37.

The square root of 2545663321 is about 50454.5668993402. The cubic root of 2545663321 is about 1365.4222903240.

It can be divided in two parts, 25 and 45663321, that added together give a triangular number (45663346 = T₉₅₅₆).

The spelling of 2545663321 in words is "two billion, five hundred forty-five million, six hundred sixty-three thousand, three hundred twenty-one".