2164645442645 has 24 divisors (see below), whose sum is σ = 3066767882784. Its totient is φ = 1462174138656.

The previous prime is 2164645442593. The next prime is 2164645442647. The reversal of 2164645442645 is 5462445464612.

It is not a de Polignac number, because 2164645442645 - 2⁶ = 2164645442581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2164645442647) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 65918567 + ... + 65951396.

It is an arithmetic number, because the mean of its divisors is an integer number (127781995116).

Almost surely, 2^{2164645442645} is an apocalyptic number.

It is an amenable number.

2164645442645 is a deficient number, since it is larger than the sum of its proper divisors (902122440139).

2164645442645 is a wasteful number, since it uses less digits than its factorization.

2164645442645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131870049 (or 131870042 counting only the distinct ones).

The product of its digits is 22118400, while the sum is 53.

The spelling of 2164645442645 in words is "two trillion, one hundred sixty-four billion, six hundred forty-five million, four hundred forty-two thousand, six hundred forty-five".