87705941641 has 2 divisors, whose sum is σ = 87705941642. Its totient is φ = 87705941640.

The previous prime is 87705941621. The next prime is 87705941747. The reversal of 87705941641 is 14614950778.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44772444025 + 42933497616 = 211595^2 + 207204^2 .

It is a cyclic number.

It is not a de Polignac number, because 87705941641 - 2⁹ = 87705941129 is a prime.

It is not a weakly prime, because it can be changed into another prime (87705941621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43852970820 + 43852970821.

It is an arithmetic number, because the mean of its divisors is an integer number (43852970821).

Almost surely, 2^87705941641 is an apocalyptic number.

It is an amenable number.

87705941641 is a deficient number, since it is larger than the sum of its proper divisors (1).

87705941641 is an equidigital number, since it uses as much as digits as its factorization.

87705941641 is an evil number, because the sum of its binary digits is even.

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

The spelling of 87705941641 in words is "eighty-seven billion, seven hundred five million, nine hundred forty-one thousand, six hundred forty-one".