381777105581 has 2 divisors, whose sum is σ = 381777105582. Its totient is φ = 381777105580.

The previous prime is 381777105559. The next prime is 381777105601. The reversal of 381777105581 is 185501777183.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 321976804900 + 59800300681 = 567430^2 + 244541^2 .

It is a cyclic number.

It is not a de Polignac number, because 381777105581 - 2²² = 381772911277 is a prime.

It is a super-2 number, since 2×381777105581² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (381777125581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190888552790 + 190888552791.

It is an arithmetic number, because the mean of its divisors is an integer number (190888552791).

Almost surely, 2^381777105581 is an apocalyptic number.

It is an amenable number.

381777105581 is a deficient number, since it is larger than the sum of its proper divisors (1).

381777105581 is an equidigital number, since it uses as much as digits as its factorization.

381777105581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1646400, while the sum is 53.

The spelling of 381777105581 in words is "three hundred eighty-one billion, seven hundred seventy-seven million, one hundred five thousand, five hundred eighty-one".