18585731431877 has 2 divisors, whose sum is σ = 18585731431878. Its totient is φ = 18585731431876.

The previous prime is 18585731431853. The next prime is 18585731431921. The reversal of 18585731431877 is 77813413758581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18430243958116 + 155487473761 = 4293046^2 + 394319^2 .

It is a cyclic number.

It is not a de Polignac number, because 18585731431877 - 2³⁸ = 18310853524933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18585731431577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9292865715938 + 9292865715939.

It is an arithmetic number, because the mean of its divisors is an integer number (9292865715939).

Almost surely, 2^{18585731431877} is an apocalyptic number.

It is an amenable number.

18585731431877 is a deficient number, since it is larger than the sum of its proper divisors (1).

18585731431877 is an equidigital number, since it uses as much as digits as its factorization.

18585731431877 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 158054400, while the sum is 68.

The spelling of 18585731431877 in words is "eighteen trillion, five hundred eighty-five billion, seven hundred thirty-one million, four hundred thirty-one thousand, eight hundred seventy-seven".