8327620661 has 2 divisors, whose sum is σ = 8327620662. Its totient is φ = 8327620660.

The previous prime is 8327620583. The next prime is 8327620699. The reversal of 8327620661 is 1660267238.

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., 6728100625 + 1599520036 = 82025^2 + 39994^2 .

It is a cyclic number.

It is not a de Polignac number, because 8327620661 - 2¹⁸ = 8327358517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8327620261) 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, 4163810330 + 4163810331.

It is an arithmetic number, because the mean of its divisors is an integer number (4163810331).

Almost surely, 2^8327620661 is an apocalyptic number.

It is an amenable number.

8327620661 is a deficient number, since it is larger than the sum of its proper divisors (1).

8327620661 is an equidigital number, since it uses as much as digits as its factorization.

8327620661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 41.

The square root of 8327620661 is about 91255.7979582667. The cubic root of 8327620661 is about 2026.9372842617.

Adding to 8327620661 its reverse (1660267238), we get a palindrome (9987887899).

The spelling of 8327620661 in words is "eight billion, three hundred twenty-seven million, six hundred twenty thousand, six hundred sixty-one".