87205051643 has 2 divisors, whose sum is σ = 87205051644. Its totient is φ = 87205051642.

The previous prime is 87205051613. The next prime is 87205051667. The reversal of 87205051643 is 34615050278.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 87205051643 - 2¹⁶ = 87204986107 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 87205051643.

It is not a weakly prime, because it can be changed into another prime (87205051603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43602525821 + 43602525822.

It is an arithmetic number, because the mean of its divisors is an integer number (43602525822).

Almost surely, 2^87205051643 is an apocalyptic number.

87205051643 is a deficient number, since it is larger than the sum of its proper divisors (1).

87205051643 is an equidigital number, since it uses as much as digits as its factorization.

87205051643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 201600, while the sum is 41.

The spelling of 87205051643 in words is "eighty-seven billion, two hundred five million, fifty-one thousand, six hundred forty-three".