86186531077 has 2 divisors, whose sum is σ = 86186531078. Its totient is φ = 86186531076.

The previous prime is 86186531051. The next prime is 86186531143. The reversal of 86186531077 is 77013568168.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71612971236 + 14573559841 = 267606^2 + 120721^2 .

It is a cyclic number.

It is not a de Polignac number, because 86186531077 - 2⁷ = 86186530949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86186531027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43093265538 + 43093265539.

It is an arithmetic number, because the mean of its divisors is an integer number (43093265539).

Almost surely, 2^86186531077 is an apocalyptic number.

It is an amenable number.

86186531077 is a deficient number, since it is larger than the sum of its proper divisors (1).

86186531077 is an equidigital number, since it uses as much as digits as its factorization.

86186531077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1693440, while the sum is 52.

The spelling of 86186531077 in words is "eighty-six billion, one hundred eighty-six million, five hundred thirty-one thousand, seventy-seven".