887361640820581 has 2 divisors, whose sum is σ = 887361640820582. Its totient is φ = 887361640820580.

The previous prime is 887361640820563. The next prime is 887361640820587. The reversal of 887361640820581 is 185028046163788.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 767900019798081 + 119461621022500 = 27711009^2 + 10929850^2 .

It is a cyclic number.

It is not a de Polignac number, because 887361640820581 - 2⁵ = 887361640820549 is a prime.

It is a super-2 number, since 2×887361640820581² (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 (887361640820587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 443680820410290 + 443680820410291.

It is an arithmetic number, because the mean of its divisors is an integer number (443680820410291).

Almost surely, 2^{887361640820581} is an apocalyptic number.

It is an amenable number.

887361640820581 is a deficient number, since it is larger than the sum of its proper divisors (1).

887361640820581 is an equidigital number, since it uses as much as digits as its factorization.

887361640820581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 123863040, while the sum is 67.

The spelling of 887361640820581 in words is "eight hundred eighty-seven trillion, three hundred sixty-one billion, six hundred forty million, eight hundred twenty thousand, five hundred eighty-one".