85981166333 has 2 divisors, whose sum is σ = 85981166334. Its totient is φ = 85981166332.

The previous prime is 85981166291. The next prime is 85981166399. The reversal of 85981166333 is 33366118958.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64985735929 + 20995430404 = 254923^2 + 144898^2 .

It is a cyclic number.

It is not a de Polignac number, because 85981166333 - 2¹² = 85981162237 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85981160333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42990583166 + 42990583167.

It is an arithmetic number, because the mean of its divisors is an integer number (42990583167).

Almost surely, 2^85981166333 is an apocalyptic number.

It is an amenable number.

85981166333 is a deficient number, since it is larger than the sum of its proper divisors (1).

85981166333 is an equidigital number, since it uses as much as digits as its factorization.

85981166333 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2799360, while the sum is 53.

The spelling of 85981166333 in words is "eighty-five billion, nine hundred eighty-one million, one hundred sixty-six thousand, three hundred thirty-three".