1813711018557 has 4 divisors (see below), whose sum is σ = 2418281358080. Its totient is φ = 1209140679036.

The previous prime is 1813711018547. The next prime is 1813711018601. The reversal of 1813711018557 is 7558101173181.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1813711018557 - 2¹⁸ = 1813710756413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1813711018547) 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, 302285169757 + ... + 302285169762.

It is an arithmetic number, because the mean of its divisors is an integer number (604570339520).

Almost surely, 2^{1813711018557} is an apocalyptic number.

It is an amenable number.

1813711018557 is a deficient number, since it is larger than the sum of its proper divisors (604570339523).

1813711018557 is an equidigital number, since it uses as much as digits as its factorization.

1813711018557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 604570339522.

The product of its (nonzero) digits is 235200, while the sum is 48.

The spelling of 1813711018557 in words is "one trillion, eight hundred thirteen billion, seven hundred eleven million, eighteen thousand, five hundred fifty-seven".