2658223661 has 2 divisors, whose sum is σ = 2658223662. Its totient is φ = 2658223660.

The previous prime is 2658223651. The next prime is 2658223753. The reversal of 2658223661 is 1663228562.

It is a happy number.

2658223661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1653967561 + 1004256100 = 40669^2 + 31690^2 .

It is a cyclic number.

It is not a de Polignac number, because 2658223661 - 2¹⁸ = 2657961517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2658223651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1329111830 + 1329111831.

It is an arithmetic number, because the mean of its divisors is an integer number (1329111831).

Almost surely, 2^2658223661 is an apocalyptic number.

It is an amenable number.

2658223661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2658223661 is an equidigital number, since it uses as much as digits as its factorization.

2658223661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 207360, while the sum is 41.

The square root of 2658223661 is about 51557.9640889747. The cubic root of 2658223661 is about 1385.2574881302.

The spelling of 2658223661 in words is "two billion, six hundred fifty-eight million, two hundred twenty-three thousand, six hundred sixty-one".