82645555571 has 2 divisors, whose sum is σ = 82645555572. Its totient is φ = 82645555570.

The previous prime is 82645555561. The next prime is 82645555579. The reversal of 82645555571 is 17555554628.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 82645555571 - 2⁶ = 82645555507 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (82645555579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41322777785 + 41322777786.

It is an arithmetic number, because the mean of its divisors is an integer number (41322777786).

Almost surely, 2^82645555571 is an apocalyptic number.

82645555571 is a deficient number, since it is larger than the sum of its proper divisors (1).

82645555571 is an equidigital number, since it uses as much as digits as its factorization.

82645555571 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8400000, while the sum is 53.

The spelling of 82645555571 in words is "eighty-two billion, six hundred forty-five million, five hundred fifty-five thousand, five hundred seventy-one".