85434442081 has 2 divisors, whose sum is σ = 85434442082. Its totient is φ = 85434442080.

The previous prime is 85434441991. The next prime is 85434442111. The reversal of 85434442081 is 18024443458.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77587317025 + 7847125056 = 278545^2 + 88584^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85434442081 is a prime.

It is a super-2 number, since 2×85434442081² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (85434422081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42717221040 + 42717221041.

It is an arithmetic number, because the mean of its divisors is an integer number (42717221041).

Almost surely, 2^85434442081 is an apocalyptic number.

It is an amenable number.

85434442081 is a deficient number, since it is larger than the sum of its proper divisors (1).

85434442081 is an equidigital number, since it uses as much as digits as its factorization.

85434442081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 491520, while the sum is 43.

The spelling of 85434442081 in words is "eighty-five billion, four hundred thirty-four million, four hundred forty-two thousand, eighty-one".