85987916237 has 2 divisors, whose sum is σ = 85987916238. Its totient is φ = 85987916236.

The previous prime is 85987916213. The next prime is 85987916239. The reversal of 85987916237 is 73261978958.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63570041161 + 22417875076 = 252131^2 + 149726^2 .

It is a cyclic number.

It is not a de Polignac number, because 85987916237 - 2²⁰ = 85986867661 is a prime.

Together with 85987916239, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85987916239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42993958118 + 42993958119.

It is an arithmetic number, because the mean of its divisors is an integer number (42993958119).

Almost surely, 2^85987916237 is an apocalyptic number.

It is an amenable number.

85987916237 is a deficient number, since it is larger than the sum of its proper divisors (1).

85987916237 is an equidigital number, since it uses as much as digits as its factorization.

85987916237 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45722880, while the sum is 65.

The spelling of 85987916237 in words is "eighty-five billion, nine hundred eighty-seven million, nine hundred sixteen thousand, two hundred thirty-seven".