2178325161 has 12 divisors (see below), whose sum is σ = 3231509892. Its totient is φ = 1412967456.

The previous prime is 2178325157. The next prime is 2178325181. The reversal of 2178325161 is 1615238712.

2178325161 is a `hidden beast` number, since 2 + 178 + 325 + 161 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1604483136 + 573842025 = 40056^2 + 23955^2 .

It is not a de Polignac number, because 2178325161 - 2² = 2178325157 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2178325181) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3270426 + ... + 3271091.

It is an arithmetic number, because the mean of its divisors is an integer number (269292491).

Almost surely, 2^2178325161 is an apocalyptic number.

It is an amenable number.

2178325161 is a deficient number, since it is larger than the sum of its proper divisors (1053184731).

2178325161 is a wasteful number, since it uses less digits than its factorization.

2178325161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6541560 (or 6541557 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 2178325161 is about 46672.5311184213. The cubic root of 2178325161 is about 1296.3061137474.

The spelling of 2178325161 in words is "two billion, one hundred seventy-eight million, three hundred twenty-five thousand, one hundred sixty-one".