81811483433 has 2 divisors, whose sum is σ = 81811483434. Its totient is φ = 81811483432.

The previous prime is 81811483361. The next prime is 81811483447. The reversal of 81811483433 is 33438411818.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69483378409 + 12328105024 = 263597^2 + 111032^2 .

It is a cyclic number.

It is not a de Polignac number, because 81811483433 - 2²² = 81807289129 is a prime.

It is not a weakly prime, because it can be changed into another prime (81811483463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40905741716 + 40905741717.

It is an arithmetic number, because the mean of its divisors is an integer number (40905741717).

Almost surely, 2^81811483433 is an apocalyptic number.

It is an amenable number.

81811483433 is a deficient number, since it is larger than the sum of its proper divisors (1).

81811483433 is an equidigital number, since it uses as much as digits as its factorization.

81811483433 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 221184, while the sum is 44.

The spelling of 81811483433 in words is "eighty-one billion, eight hundred eleven million, four hundred eighty-three thousand, four hundred thirty-three".