1813930506611 has 4 divisors (see below), whose sum is σ = 1835785091112. Its totient is φ = 1792075922112.

The previous prime is 1813930506589. The next prime is 1813930506631. The reversal of 1813930506611 is 1166050393181.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1813930506611 - 2³⁴ = 1796750637427 is a prime.

It is a super-2 number, since 2×1813930506611² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1813930506631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10927292126 + ... + 10927292291.

It is an arithmetic number, because the mean of its divisors is an integer number (458946272778).

Almost surely, 2^{1813930506611} is an apocalyptic number.

1813930506611 is a deficient number, since it is larger than the sum of its proper divisors (21854584501).

1813930506611 is an equidigital number, since it uses as much as digits as its factorization.

1813930506611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21854584500.

The product of its (nonzero) digits is 116640, while the sum is 44.

Adding to 1813930506611 its reverse (1166050393181), we get a palindrome (2979980899792).

The spelling of 1813930506611 in words is "one trillion, eight hundred thirteen billion, nine hundred thirty million, five hundred six thousand, six hundred eleven".