4645623221 has 2 divisors, whose sum is σ = 4645623222. Its totient is φ = 4645623220.

The previous prime is 4645623181. The next prime is 4645623233. The reversal of 4645623221 is 1223265464.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3509259121 + 1136364100 = 59239^2 + 33710^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4645623221 is a prime.

It is a super-2 number, since 2×4645623221² = 43163630222988829682, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4645623251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2322811610 + 2322811611.

It is an arithmetic number, because the mean of its divisors is an integer number (2322811611).

Almost surely, 2^4645623221 is an apocalyptic number.

It is an amenable number.

4645623221 is a deficient number, since it is larger than the sum of its proper divisors (1).

4645623221 is an equidigital number, since it uses as much as digits as its factorization.

4645623221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69120, while the sum is 35.

The square root of 4645623221 is about 68158.8088290868. The cubic root of 4645623221 is about 1668.5836917945.

Adding to 4645623221 its reverse (1223265464), we get a palindrome (5868888685).

The spelling of 4645623221 in words is "four billion, six hundred forty-five million, six hundred twenty-three thousand, two hundred twenty-one".