1845220372173 has 6 divisors (see below), whose sum is σ = 2665318315374. Its totient is φ = 1230146914776.

The previous prime is 1845220372159. The next prime is 1845220372223. The reversal of 1845220372173 is 3712730225481.

1845220372173 is a `hidden beast` number, since 1 + 8 + 4 + 522 + 0 + 37 + 21 + 73 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1208445099849 + 636775272324 = 1099293^2 + 797982^2 .

It is not a de Polignac number, because 1845220372173 - 2¹⁷ = 1845220241101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1845220372973) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 102512242890 + ... + 102512242907.

It is an arithmetic number, because the mean of its divisors is an integer number (444219719229).

Almost surely, 2^{1845220372173} is an apocalyptic number.

It is an amenable number.

1845220372173 is a deficient number, since it is larger than the sum of its proper divisors (820097943201).

1845220372173 is a wasteful number, since it uses less digits than its factorization.

1845220372173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205024485803 (or 205024485800 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 45.

The spelling of 1845220372173 in words is "one trillion, eight hundred forty-five billion, two hundred twenty million, three hundred seventy-two thousand, one hundred seventy-three".