82666013 has 2 divisors, whose sum is σ = 82666014. Its totient is φ = 82666012.

The previous prime is 82665949. The next prime is 82666033. The reversal of 82666013 is 31066628.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44448889 + 38217124 = 6667^2 + 6182^2 .

It is a cyclic number.

It is not a de Polignac number, because 82666013 - 2⁶ = 82665949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82666033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41333006 + 41333007.

It is an arithmetic number, because the mean of its divisors is an integer number (41333007).

Almost surely, 2^82666013 is an apocalyptic number.

It is an amenable number.

82666013 is a deficient number, since it is larger than the sum of its proper divisors (1).

82666013 is an equidigital number, since it uses as much as digits as its factorization.

82666013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 82666013 is about 9092.0851843788. The cubic root of 82666013 is about 435.6211902767.

The spelling of 82666013 in words is "eighty-two million, six hundred sixty-six thousand, thirteen".