85640808941 has 2 divisors, whose sum is σ = 85640808942. Its totient is φ = 85640808940.

The previous prime is 85640808887. The next prime is 85640808973. The reversal of 85640808941 is 14980804658.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42992363716 + 42648445225 = 207346^2 + 206515^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85640808941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85640802941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42820404470 + 42820404471.

It is an arithmetic number, because the mean of its divisors is an integer number (42820404471).

Almost surely, 2^85640808941 is an apocalyptic number.

It is an amenable number.

85640808941 is a deficient number, since it is larger than the sum of its proper divisors (1).

85640808941 is an equidigital number, since it uses as much as digits as its factorization.

85640808941 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2211840, while the sum is 53.

The spelling of 85640808941 in words is "eighty-five billion, six hundred forty million, eight hundred eight thousand, nine hundred forty-one".