2145406623265 has 4 divisors (see below), whose sum is σ = 2574487947924. Its totient is φ = 1716325298608.

The previous prime is 2145406623263. The next prime is 2145406623289. The reversal of 2145406623265 is 5623266045412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1505852945424 + 639553677841 = 1227132^2 + 799721^2 .

It is a cyclic number.

It is not a de Polignac number, because 2145406623265 - 2¹ = 2145406623263 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2145406623263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 214540662322 + ... + 214540662331.

It is an arithmetic number, because the mean of its divisors is an integer number (643621986981).

Almost surely, 2^{2145406623265} is an apocalyptic number.

It is an amenable number.

2145406623265 is a deficient number, since it is larger than the sum of its proper divisors (429081324659).

2145406623265 is an equidigital number, since it uses as much as digits as its factorization.

2145406623265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429081324658.

The product of its (nonzero) digits is 2073600, while the sum is 46.

The spelling of 2145406623265 in words is "two trillion, one hundred forty-five billion, four hundred six million, six hundred twenty-three thousand, two hundred sixty-five".