865124785117 has 2 divisors, whose sum is σ = 865124785118. Its totient is φ = 865124785116.

The previous prime is 865124784989. The next prime is 865124785127. The reversal of 865124785117 is 711587421568.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 510497389081 + 354627396036 = 714491^2 + 595506^2 .

It is a cyclic number.

It is not a de Polignac number, because 865124785117 - 2⁷ = 865124784989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (865124785127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432562392558 + 432562392559.

It is an arithmetic number, because the mean of its divisors is an integer number (432562392559).

Almost surely, 2^865124785117 is an apocalyptic number.

It is an amenable number.

865124785117 is a deficient number, since it is larger than the sum of its proper divisors (1).

865124785117 is an equidigital number, since it uses as much as digits as its factorization.

865124785117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3763200, while the sum is 55.

The spelling of 865124785117 in words is "eight hundred sixty-five billion, one hundred twenty-four million, seven hundred eighty-five thousand, one hundred seventeen".