82864869781 has 2 divisors, whose sum is σ = 82864869782. Its totient is φ = 82864869780.

The previous prime is 82864869743. The next prime is 82864869811. The reversal of 82864869781 is 18796846828.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82019804881 + 845064900 = 286391^2 + 29070^2 .

It is a cyclic number.

It is not a de Polignac number, because 82864869781 - 2¹¹ = 82864867733 is a prime.

It is a super-2 number, since 2×82864869781² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82864869281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41432434890 + 41432434891.

It is an arithmetic number, because the mean of its divisors is an integer number (41432434891).

Almost surely, 2^82864869781 is an apocalyptic number.

It is an amenable number.

82864869781 is a deficient number, since it is larger than the sum of its proper divisors (1).

82864869781 is an equidigital number, since it uses as much as digits as its factorization.

82864869781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 74317824, while the sum is 67.

The spelling of 82864869781 in words is "eighty-two billion, eight hundred sixty-four million, eight hundred sixty-nine thousand, seven hundred eighty-one".