85535871991 has 2 divisors, whose sum is σ = 85535871992. Its totient is φ = 85535871990.

The previous prime is 85535871931. The next prime is 85535872007. The reversal of 85535871991 is 19917853558.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85535871991 - 2¹³ = 85535863799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85535871931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42767935995 + 42767935996.

It is an arithmetic number, because the mean of its divisors is an integer number (42767935996).

Almost surely, 2^85535871991 is an apocalyptic number.

85535871991 is a deficient number, since it is larger than the sum of its proper divisors (1).

85535871991 is an equidigital number, since it uses as much as digits as its factorization.

85535871991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13608000, while the sum is 61.

The spelling of 85535871991 in words is "eighty-five billion, five hundred thirty-five million, eight hundred seventy-one thousand, nine hundred ninety-one".