82666687 has 2 divisors, whose sum is σ = 82666688. Its totient is φ = 82666686.

The previous prime is 82666681. The next prime is 82666691. The reversal of 82666687 is 78666628.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82666687 is a prime.

It is a super-2 number, since 2×82666687² = 13667562279111938, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 82666687.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82666681) 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, 41333343 + 41333344.

It is an arithmetic number, because the mean of its divisors is an integer number (41333344).

Almost surely, 2^82666687 is an apocalyptic number.

82666687 is a deficient number, since it is larger than the sum of its proper divisors (1).

82666687 is an equidigital number, since it uses as much as digits as its factorization.

82666687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1161216, while the sum is 49.

The square root of 82666687 is about 9092.1222495081. The cubic root of 82666687 is about 435.6223741888.

The spelling of 82666687 in words is "eighty-two million, six hundred sixty-six thousand, six hundred eighty-seven".