82666637 has 2 divisors, whose sum is σ = 82666638. Its totient is φ = 82666636.

The previous prime is 82666613. The next prime is 82666657. The reversal of 82666637 is 73666628.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45346756 + 37319881 = 6734^2 + 6109^2 .

It is a cyclic number.

It is not a de Polignac number, because 82666637 - 2²² = 78472333 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82666607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41333318 + 41333319.

It is an arithmetic number, because the mean of its divisors is an integer number (41333319).

Almost surely, 2^82666637 is an apocalyptic number.

It is an amenable number.

82666637 is a deficient number, since it is larger than the sum of its proper divisors (1).

82666637 is an equidigital number, since it uses as much as digits as its factorization.

82666637 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 44.

The square root of 82666637 is about 9092.1194998746. The cubic root of 82666637 is about 435.6222863618.

Subtracting from 82666637 its reverse (73666628), we obtain a palindrome (9000009).

The spelling of 82666637 in words is "eighty-two million, six hundred sixty-six thousand, six hundred thirty-seven".