6633620681 has 2 divisors, whose sum is σ = 6633620682. Its totient is φ = 6633620680.

The previous prime is 6633620633. The next prime is 6633620683. The reversal of 6633620681 is 1860263366.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4662704656 + 1970916025 = 68284^2 + 44395^2 .

It is a cyclic number.

It is not a de Polignac number, because 6633620681 - 2¹⁴ = 6633604297 is a prime.

It is a super-2 number, since 2×6633620681² = 88009846678781807522, which contains 22 as substring.

Together with 6633620683, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6633620683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3316810340 + 3316810341.

It is an arithmetic number, because the mean of its divisors is an integer number (3316810341).

Almost surely, 2^6633620681 is an apocalyptic number.

It is an amenable number.

6633620681 is a deficient number, since it is larger than the sum of its proper divisors (1).

6633620681 is an equidigital number, since it uses as much as digits as its factorization.

6633620681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 186624, while the sum is 41.

The square root of 6633620681 is about 81447.0421869327. The cubic root of 6633620681 is about 1878.9571590215.

The spelling of 6633620681 in words is "six billion, six hundred thirty-three million, six hundred twenty thousand, six hundred eighty-one".