81600654229 has 2 divisors, whose sum is σ = 81600654230. Its totient is φ = 81600654228.

The previous prime is 81600654209. The next prime is 81600654253. The reversal of 81600654229 is 92245600618.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72398664900 + 9201989329 = 269070^2 + 95927^2 .

It is a cyclic number.

It is not a de Polignac number, because 81600654229 - 2⁵ = 81600654197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81600654209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40800327114 + 40800327115.

It is an arithmetic number, because the mean of its divisors is an integer number (40800327115).

Almost surely, 2^81600654229 is an apocalyptic number.

It is an amenable number.

81600654229 is a deficient number, since it is larger than the sum of its proper divisors (1).

81600654229 is an equidigital number, since it uses as much as digits as its factorization.

81600654229 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 207360, while the sum is 43.

The spelling of 81600654229 in words is "eighty-one billion, six hundred million, six hundred fifty-four thousand, two hundred twenty-nine".