2170804384961 has 4 divisors (see below), whose sum is σ = 2180121142212. Its totient is φ = 2161487627712.

The previous prime is 2170804384921. The next prime is 2170804385033. The reversal of 2170804384961 is 1694834080712.

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 1450290318400 + 720514066561 = 1204280^2 + 848831^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2170804384961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2170804384901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4658378276 + ... + 4658378741.

It is an arithmetic number, because the mean of its divisors is an integer number (545030285553).

Almost surely, 2^{2170804384961} is an apocalyptic number.

It is an amenable number.

2170804384961 is a deficient number, since it is larger than the sum of its proper divisors (9316757251).

2170804384961 is an equidigital number, since it uses as much as digits as its factorization.

2170804384961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9316757250.

The product of its (nonzero) digits is 2322432, while the sum is 53.

The spelling of 2170804384961 in words is "two trillion, one hundred seventy billion, eight hundred four million, three hundred eighty-four thousand, nine hundred sixty-one".