5326661621 has 2 divisors, whose sum is σ = 5326661622. Its totient is φ = 5326661620.

The previous prime is 5326661579. The next prime is 5326661651. The reversal of 5326661621 is 1261666235.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4191915025 + 1134746596 = 64745^2 + 33686^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5326661621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5326661651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2663330810 + 2663330811.

It is an arithmetic number, because the mean of its divisors is an integer number (2663330811).

Almost surely, 2^5326661621 is an apocalyptic number.

It is an amenable number.

5326661621 is a deficient number, since it is larger than the sum of its proper divisors (1).

5326661621 is an equidigital number, since it uses as much as digits as its factorization.

5326661621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 38.

The square root of 5326661621 is about 72983.9819480960. The cubic root of 5326661621 is about 1746.4320907803.

The spelling of 5326661621 in words is "five billion, three hundred twenty-six million, six hundred sixty-one thousand, six hundred twenty-one".