84532649681 has 2 divisors, whose sum is σ = 84532649682. Its totient is φ = 84532649680.

The previous prime is 84532649633. The next prime is 84532649683. The reversal of 84532649681 is 18694623548.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63360944656 + 21171705025 = 251716^2 + 145505^2 .

It is a cyclic number.

It is not a de Polignac number, because 84532649681 - 2³⁴ = 67352780497 is a prime.

It is a super-2 number, since 2×84532649681² (a number of 23 digits) contains 22 as substring.

Together with 84532649683, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (84532649683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42266324840 + 42266324841.

It is an arithmetic number, because the mean of its divisors is an integer number (42266324841).

Almost surely, 2^84532649681 is an apocalyptic number.

It is an amenable number.

84532649681 is a deficient number, since it is larger than the sum of its proper divisors (1).

84532649681 is an equidigital number, since it uses as much as digits as its factorization.

84532649681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9953280, while the sum is 56.

The spelling of 84532649681 in words is "eighty-four billion, five hundred thirty-two million, six hundred forty-nine thousand, six hundred eighty-one".