1820287649673 has 20 divisors (see below), whose sum is σ = 2719941988368. Its totient is φ = 1213191791640.

The previous prime is 1820287649623. The next prime is 1820287649743. The reversal of 1820287649673 is 3769467820281.

1820287649673 is a `hidden beast` number, since 1 + 8 + 2 + 0 + 2 + 8 + 76 + 496 + 73 = 666.

It is not a de Polignac number, because 1820287649673 - 2¹² = 1820287645577 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1820287649673.

It is not an unprimeable number, because it can be changed into a prime (1820287649623) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2789283 + ... + 3379448.

Almost surely, 2^{1820287649673} is an apocalyptic number.

It is an amenable number.

1820287649673 is a deficient number, since it is larger than the sum of its proper divisors (899654338695).

1820287649673 is an equidigital number, since it uses as much as digits as its factorization.

1820287649673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6172386 (or 6172377 counting only the distinct ones).

The product of its (nonzero) digits is 48771072, while the sum is 63.

The spelling of 1820287649673 in words is "one trillion, eight hundred twenty billion, two hundred eighty-seven million, six hundred forty-nine thousand, six hundred seventy-three".