1817825272161 has 16 divisors (see below), whose sum is σ = 2457084313920. Its totient is φ = 1195226426880.

The previous prime is 1817825272139. The next prime is 1817825272163. The reversal of 1817825272161 is 1612725287181.

It is not a de Polignac number, because 1817825272161 - 2⁶ = 1817825272097 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1817825272163) 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, 4786425 + ... + 5152233.

It is an arithmetic number, because the mean of its divisors is an integer number (153567769620).

Almost surely, 2^{1817825272161} is an apocalyptic number.

It is an amenable number.

1817825272161 is a deficient number, since it is larger than the sum of its proper divisors (639259041759).

1817825272161 is a wasteful number, since it uses less digits than its factorization.

1817825272161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388576.

The product of its digits is 752640, while the sum is 51.

The spelling of 1817825272161 in words is "one trillion, eight hundred seventeen billion, eight hundred twenty-five million, two hundred seventy-two thousand, one hundred sixty-one".