2194445125645 has 16 divisors (see below), whose sum is σ = 2727871518960. Its totient is φ = 1693493401600.

The previous prime is 2194445125643. The next prime is 2194445125657. The reversal of 2194445125645 is 5465215444912.

It can be written as a sum of positive squares in 8 ways, for example, as 120807685476 + 2073637440169 = 347574^2 + 1440013^2 .

It is not a de Polignac number, because 2194445125645 - 2¹ = 2194445125643 is a prime.

It is a super-3 number, since 3×2194445125645³ (a number of 38 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2194445125592 and 2194445125601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2194445125643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60120016 + ... + 60156505.

It is an arithmetic number, because the mean of its divisors is an integer number (170491969935).

Almost surely, 2^{2194445125645} is an apocalyptic number.

It is an amenable number.

2194445125645 is a deficient number, since it is larger than the sum of its proper divisors (533426393315).

2194445125645 is a wasteful number, since it uses less digits than its factorization.

2194445125645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120276656.

The product of its digits is 6912000, while the sum is 52.

The spelling of 2194445125645 in words is "two trillion, one hundred ninety-four billion, four hundred forty-five million, one hundred twenty-five thousand, six hundred forty-five".