87841697561 has 2 divisors, whose sum is σ = 87841697562. Its totient is φ = 87841697560.

The previous prime is 87841697549. The next prime is 87841697591. The reversal of 87841697561 is 16579614878.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87841697161 + 400 = 296381^2 + 20^2 .

It is a cyclic number.

It is not a de Polignac number, because 87841697561 - 2³⁰ = 86767955737 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 87841697494 and 87841697503.

It is not a weakly prime, because it can be changed into another prime (87841697501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43920848780 + 43920848781.

It is an arithmetic number, because the mean of its divisors is an integer number (43920848781).

Almost surely, 2^87841697561 is an apocalyptic number.

It is an amenable number.

87841697561 is a deficient number, since it is larger than the sum of its proper divisors (1).

87841697561 is an equidigital number, since it uses as much as digits as its factorization.

87841697561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20321280, while the sum is 62.

The spelling of 87841697561 in words is "eighty-seven billion, eight hundred forty-one million, six hundred ninety-seven thousand, five hundred sixty-one".