2178544232645 has 16 divisors (see below), whose sum is σ = 2855934944640. Its totient is φ = 1582161086400.

The previous prime is 2178544232581. The next prime is 2178544232647. The reversal of 2178544232645 is 5462324458712.

It is not a de Polignac number, because 2178544232645 - 2⁶ = 2178544232581 is a prime.

It is a super-3 number, since 3×2178544232645³ (a number of 38 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2178544232647) 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, 27894641 + ... + 27972630.

It is an arithmetic number, because the mean of its divisors is an integer number (178495934040).

Almost surely, 2^{2178544232645} is an apocalyptic number.

It is an amenable number.

2178544232645 is a deficient number, since it is larger than the sum of its proper divisors (677390711995).

2178544232645 is a wasteful number, since it uses less digits than its factorization.

2178544232645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55867996.

The product of its digits is 12902400, while the sum is 53.

The spelling of 2178544232645 in words is "two trillion, one hundred seventy-eight billion, five hundred forty-four million, two hundred thirty-two thousand, six hundred forty-five".