2178865553 has 2 divisors, whose sum is σ = 2178865554. Its totient is φ = 2178865552.

The previous prime is 2178865531. The next prime is 2178865561. The reversal of 2178865553 is 3555688712.

It is a happy number.

2178865553 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1711311424 + 467554129 = 41368^2 + 21623^2 .

It is a cyclic number.

It is not a de Polignac number, because 2178865553 - 2¹⁰ = 2178864529 is a prime.

It is not a weakly prime, because it can be changed into another prime (2178865573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1089432776 + 1089432777.

It is an arithmetic number, because the mean of its divisors is an integer number (1089432777).

Almost surely, 2^2178865553 is an apocalyptic number.

It is an amenable number.

2178865553 is a deficient number, since it is larger than the sum of its proper divisors (1).

2178865553 is an equidigital number, since it uses as much as digits as its factorization.

2178865553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016000, while the sum is 50.

The square root of 2178865553 is about 46678.3199462020. The cubic root of 2178865553 is about 1296.4132993881.

The spelling of 2178865553 in words is "two billion, one hundred seventy-eight million, eight hundred sixty-five thousand, five hundred fifty-three".