2573223661 has 2 divisors, whose sum is σ = 2573223662. Its totient is φ = 2573223660.

The previous prime is 2573223659. The next prime is 2573223671. The reversal of 2573223661 is 1663223752.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2295368100 + 277855561 = 47910^2 + 16669^2 .

It is a cyclic number.

It is not a de Polignac number, because 2573223661 - 2¹ = 2573223659 is a prime.

Together with 2573223659, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 2573223661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2573223671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1286611830 + 1286611831.

It is an arithmetic number, because the mean of its divisors is an integer number (1286611831).

Almost surely, 2^2573223661 is an apocalyptic number.

It is an amenable number.

2573223661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2573223661 is an equidigital number, since it uses as much as digits as its factorization.

2573223661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 37.

The square root of 2573223661 is about 50726.9520176405. The cubic root of 2573223661 is about 1370.3321447684.

Subtracting from 2573223661 its reverse (1663223752), we obtain a palindrome (909999909).

The spelling of 2573223661 in words is "two billion, five hundred seventy-three million, two hundred twenty-three thousand, six hundred sixty-one".