1806602121773 has 2 divisors, whose sum is σ = 1806602121774. Its totient is φ = 1806602121772.

The previous prime is 1806602121689. The next prime is 1806602121827. The reversal of 1806602121773 is 3771212066081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1244121621604 + 562480500169 = 1115402^2 + 749987^2 .

It is a cyclic number.

It is not a de Polignac number, because 1806602121773 - 2¹⁴ = 1806602105389 is a prime.

It is a super-2 number, since 2×1806602121773² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1806602120773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 903301060886 + 903301060887.

It is an arithmetic number, because the mean of its divisors is an integer number (903301060887).

Almost surely, 2^{1806602121773} is an apocalyptic number.

It is an amenable number.

1806602121773 is a deficient number, since it is larger than the sum of its proper divisors (1).

1806602121773 is an equidigital number, since it uses as much as digits as its factorization.

1806602121773 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 169344, while the sum is 44.

The spelling of 1806602121773 in words is "one trillion, eight hundred six billion, six hundred two million, one hundred twenty-one thousand, seven hundred seventy-three".