81589029433 has 2 divisors, whose sum is σ = 81589029434. Its totient is φ = 81589029432.

The previous prime is 81589029413. The next prime is 81589029443. The reversal of 81589029433 is 33492098518.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79517232144 + 2071797289 = 281988^2 + 45517^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81589029433 is a prime.

It is not a weakly prime, because it can be changed into another prime (81589029413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40794514716 + 40794514717.

It is an arithmetic number, because the mean of its divisors is an integer number (40794514717).

Almost surely, 2^81589029433 is an apocalyptic number.

It is an amenable number.

81589029433 is a deficient number, since it is larger than the sum of its proper divisors (1).

81589029433 is an equidigital number, since it uses as much as digits as its factorization.

81589029433 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1866240, while the sum is 52.

The spelling of 81589029433 in words is "eighty-one billion, five hundred eighty-nine million, twenty-nine thousand, four hundred thirty-three".