2177980095805 has 4 divisors (see below), whose sum is σ = 2613576114972. Its totient is φ = 1742384076640.

The previous prime is 2177980095799. The next prime is 2177980095817. The reversal of 2177980095805 is 5085900897712.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1082009798809 + 1095970296996 = 1040197^2 + 1046886^2 .

It is a de Polignac number, because none of the positive numbers 2^k-2177980095805 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 217798009576 + ... + 217798009585.

It is an arithmetic number, because the mean of its divisors is an integer number (653394028743).

Almost surely, 2^{2177980095805} is an apocalyptic number.

It is an amenable number.

2177980095805 is a deficient number, since it is larger than the sum of its proper divisors (435596019167).

2177980095805 is an equidigital number, since it uses as much as digits as its factorization.

2177980095805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435596019166.

The product of its (nonzero) digits is 12700800, while the sum is 61.

The spelling of 2177980095805 in words is "two trillion, one hundred seventy-seven billion, nine hundred eighty million, ninety-five thousand, eight hundred five".