2145404065 has 32 divisors (see below), whose sum is σ = 3025382400. Its totient is φ = 1430006784.

The previous prime is 2145404047. The next prime is 2145404069. The reversal of 2145404065 is 5604045412.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2145404065 - 2⁷ = 2145403937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2145404069) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 240729 + ... + 249481.

It is an arithmetic number, because the mean of its divisors is an integer number (94543200).

Almost surely, 2^2145404065 is an apocalyptic number.

It is an amenable number.

2145404065 is a deficient number, since it is larger than the sum of its proper divisors (879978335).

2145404065 is a wasteful number, since it uses less digits than its factorization.

2145404065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8961.

The product of its (nonzero) digits is 19200, while the sum is 31.

The square root of 2145404065 is about 46318.5067224754. The cubic root of 2145404065 is about 1289.7425652589.

Adding to 2145404065 its reverse (5604045412), we get a palindrome (7749449477).

The spelling of 2145404065 in words is "two billion, one hundred forty-five million, four hundred four thousand, sixty-five".