82407791909 has 2 divisors, whose sum is σ = 82407791910. Its totient is φ = 82407791908.

The previous prime is 82407791899. The next prime is 82407791957. The reversal of 82407791909 is 90919770428.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82079385025 + 328406884 = 286495^2 + 18122^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82407791909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82407791989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41203895954 + 41203895955.

It is an arithmetic number, because the mean of its divisors is an integer number (41203895955).

Almost surely, 2^82407791909 is an apocalyptic number.

It is an amenable number.

82407791909 is a deficient number, since it is larger than the sum of its proper divisors (1).

82407791909 is an equidigital number, since it uses as much as digits as its factorization.

82407791909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2286144, while the sum is 56.

The spelling of 82407791909 in words is "eighty-two billion, four hundred seven million, seven hundred ninety-one thousand, nine hundred nine".