8464816621 has 2 divisors, whose sum is σ = 8464816622. Its totient is φ = 8464816620.

The previous prime is 8464816601. The next prime is 8464816627. The reversal of 8464816621 is 1266184648.

8464816621 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8066015721 + 398800900 = 89811^2 + 19970^2 .

It is a cyclic number.

It is not a de Polignac number, because 8464816621 - 2⁵ = 8464816589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8464816627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4232408310 + 4232408311.

It is an arithmetic number, because the mean of its divisors is an integer number (4232408311).

Almost surely, 2^8464816621 is an apocalyptic number.

It is an amenable number.

8464816621 is a deficient number, since it is larger than the sum of its proper divisors (1).

8464816621 is an equidigital number, since it uses as much as digits as its factorization.

8464816621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 442368, while the sum is 46.

The square root of 8464816621 is about 92004.4380505636. The cubic root of 8464816621 is about 2038.0078447849.

The spelling of 8464816621 in words is "eight billion, four hundred sixty-four million, eight hundred sixteen thousand, six hundred twenty-one".