85571555533 has 2 divisors, whose sum is σ = 85571555534. Its totient is φ = 85571555532.

The previous prime is 85571555401. The next prime is 85571555579. The reversal of 85571555533 is 33555517558.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71707199524 + 13864356009 = 267782^2 + 117747^2 .

It is a cyclic number.

It is not a de Polignac number, because 85571555533 - 2³³ = 76981620941 is a prime.

It is a super-2 number, since 2×85571555533² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85571505533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42785777766 + 42785777767.

It is an arithmetic number, because the mean of its divisors is an integer number (42785777767).

Almost surely, 2^85571555533 is an apocalyptic number.

It is an amenable number.

85571555533 is a deficient number, since it is larger than the sum of its proper divisors (1).

85571555533 is an equidigital number, since it uses as much as digits as its factorization.

85571555533 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7875000, while the sum is 52.

The spelling of 85571555533 in words is "eighty-five billion, five hundred seventy-one million, five hundred fifty-five thousand, five hundred thirty-three".