2178660947201 has 2 divisors, whose sum is σ = 2178660947202. Its totient is φ = 2178660947200.

The previous prime is 2178660947159. The next prime is 2178660947249. The reversal of 2178660947201 is 1027490668712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1988847370225 + 189813576976 = 1410265^2 + 435676^2 .

It is a cyclic number.

It is not a de Polignac number, because 2178660947201 - 2¹⁰ = 2178660946177 is a prime.

It is not a weakly prime, because it can be changed into another prime (2178660947261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1089330473600 + 1089330473601.

It is an arithmetic number, because the mean of its divisors is an integer number (1089330473601).

Almost surely, 2^{2178660947201} is an apocalyptic number.

It is an amenable number.

2178660947201 is a deficient number, since it is larger than the sum of its proper divisors (1).

2178660947201 is an equidigital number, since it uses as much as digits as its factorization.

2178660947201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2032128, while the sum is 53.

The spelling of 2178660947201 in words is "two trillion, one hundred seventy-eight billion, six hundred sixty million, nine hundred forty-seven thousand, two hundred one".