85913187817 has 2 divisors, whose sum is σ = 85913187818. Its totient is φ = 85913187816.

The previous prime is 85913187809. The next prime is 85913187907. The reversal of 85913187817 is 71878131958.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76870889536 + 9042298281 = 277256^2 + 95091^2 .

It is a cyclic number.

It is not a de Polignac number, because 85913187817 - 2³ = 85913187809 is a prime.

It is not a weakly prime, because it can be changed into another prime (85913184817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42956593908 + 42956593909.

It is an arithmetic number, because the mean of its divisors is an integer number (42956593909).

Almost surely, 2^85913187817 is an apocalyptic number.

It is an amenable number.

85913187817 is a deficient number, since it is larger than the sum of its proper divisors (1).

85913187817 is an equidigital number, since it uses as much as digits as its factorization.

85913187817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3386880, while the sum is 58.

The spelling of 85913187817 in words is "eighty-five billion, nine hundred thirteen million, one hundred eighty-seven thousand, eight hundred seventeen".