6641922557 has 2 divisors, whose sum is σ = 6641922558. Its totient is φ = 6641922556.

The previous prime is 6641922517. The next prime is 6641922583. The reversal of 6641922557 is 7552291466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5338640356 + 1303282201 = 73066^2 + 36101^2 .

It is a cyclic number.

It is not a de Polignac number, because 6641922557 - 2³⁰ = 5568180733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6641922517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3320961278 + 3320961279.

It is an arithmetic number, because the mean of its divisors is an integer number (3320961279).

Almost surely, 2^6641922557 is an apocalyptic number.

It is an amenable number.

6641922557 is a deficient number, since it is larger than the sum of its proper divisors (1).

6641922557 is an equidigital number, since it uses as much as digits as its factorization.

6641922557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 907200, while the sum is 47.

The square root of 6641922557 is about 81497.9911224810. The cubic root of 6641922557 is about 1879.7406610919.

The spelling of 6641922557 in words is "six billion, six hundred forty-one million, nine hundred twenty-two thousand, five hundred fifty-seven".