85213855691 has 2 divisors, whose sum is σ = 85213855692. Its totient is φ = 85213855690.

The previous prime is 85213855667. The next prime is 85213855759. The reversal of 85213855691 is 19655831258.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85213855691 - 2¹⁰ = 85213854667 is a prime.

It is a super-2 number, since 2×85213855691² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (85215855691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42606927845 + 42606927846.

It is an arithmetic number, because the mean of its divisors is an integer number (42606927846).

Almost surely, 2^85213855691 is an apocalyptic number.

85213855691 is a deficient number, since it is larger than the sum of its proper divisors (1).

85213855691 is an equidigital number, since it uses as much as digits as its factorization.

85213855691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592000, while the sum is 53.

The spelling of 85213855691 in words is "eighty-five billion, two hundred thirteen million, eight hundred fifty-five thousand, six hundred ninety-one".