2185326178945 has 32 divisors (see below), whose sum is σ = 3239830927872. Its totient is φ = 1377979886592.

The previous prime is 2185326178927. The next prime is 2185326178949. The reversal of 2185326178945 is 5498716235812.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2185326178945 is a prime.

It is a super-2 number, since 2×2185326178945² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2185326178949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9011352 + ... + 9250681.

It is an arithmetic number, because the mean of its divisors is an integer number (101244716496).

Almost surely, 2^{2185326178945} is an apocalyptic number.

It is an amenable number.

2185326178945 is a deficient number, since it is larger than the sum of its proper divisors (1054504748927).

2185326178945 is a wasteful number, since it uses less digits than its factorization.

2185326178945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18262321.

The product of its digits is 29030400, while the sum is 61.

The spelling of 2185326178945 in words is "two trillion, one hundred eighty-five billion, three hundred twenty-six million, one hundred seventy-eight thousand, nine hundred forty-five".