1813385623253 has 2 divisors, whose sum is σ = 1813385623254. Its totient is φ = 1813385623252.

The previous prime is 1813385623249. The next prime is 1813385623261. The reversal of 1813385623253 is 3523265833181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1714363379569 + 99022243684 = 1309337^2 + 314678^2 .

It is an emirp because it is prime and its reverse (3523265833181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1813385623253 - 2² = 1813385623249 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1813385622253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 906692811626 + 906692811627.

It is an arithmetic number, because the mean of its divisors is an integer number (906692811627).

Almost surely, 2^{1813385623253} is an apocalyptic number.

It is an amenable number.

1813385623253 is a deficient number, since it is larger than the sum of its proper divisors (1).

1813385623253 is an equidigital number, since it uses as much as digits as its factorization.

1813385623253 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3110400, while the sum is 50.

The spelling of 1813385623253 in words is "one trillion, eight hundred thirteen billion, three hundred eighty-five million, six hundred twenty-three thousand, two hundred fifty-three".