855188665587031 has 2 divisors, whose sum is σ = 855188665587032. Its totient is φ = 855188665587030.

The previous prime is 855188665587013. The next prime is 855188665587049. The reversal of 855188665587031 is 130785566881558.

Together with previous prime (855188665587013) it forms an Ormiston pair, because they use the same digits, order apart.

It is a balanced prime because it is at equal distance from previous prime (855188665587013) and next prime (855188665587049).

It is a cyclic number.

It is not a de Polignac number, because 855188665587031 - 2²⁵ = 855188632032599 is a prime.

It is a super-2 number, since 2×855188665587031² (a number of 31 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (855188665587131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 427594332793515 + 427594332793516.

It is an arithmetic number, because the mean of its divisors is an integer number (427594332793516).

Almost surely, 2^{855188665587031} is an apocalyptic number.

855188665587031 is a deficient number, since it is larger than the sum of its proper divisors (1).

855188665587031 is an equidigital number, since it uses as much as digits as its factorization.

855188665587031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1935360000, while the sum is 76.

The spelling of 855188665587031 in words is "eight hundred fifty-five trillion, one hundred eighty-eight billion, six hundred sixty-five million, five hundred eighty-seven thousand, thirty-one".