1812573621653 has 2 divisors, whose sum is σ = 1812573621654. Its totient is φ = 1812573621652.

The previous prime is 1812573621589. The next prime is 1812573621667. The reversal of 1812573621653 is 3561263752181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1451104525924 + 361469095729 = 1204618^2 + 601223^2 .

It is a cyclic number.

It is not a de Polignac number, because 1812573621653 - 2⁶ = 1812573621589 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1812573620653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 906286810826 + 906286810827.

It is an arithmetic number, because the mean of its divisors is an integer number (906286810827).

Almost surely, 2^{1812573621653} is an apocalyptic number.

It is an amenable number.

1812573621653 is a deficient number, since it is larger than the sum of its proper divisors (1).

1812573621653 is an equidigital number, since it uses as much as digits as its factorization.

1812573621653 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1814400, while the sum is 50.

The spelling of 1812573621653 in words is "one trillion, eight hundred twelve billion, five hundred seventy-three million, six hundred twenty-one thousand, six hundred fifty-three".