1813678789503 has 12 divisors (see below), whose sum is σ = 2813052816600. Its totient is φ = 1036387879632.

The previous prime is 1813678789501. The next prime is 1813678789513. The reversal of 1813678789503 is 3059878763181.

It is not a de Polignac number, because 1813678789503 - 2¹ = 1813678789501 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1813678789501) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6168975328 + ... + 6168975621.

It is an arithmetic number, because the mean of its divisors is an integer number (234421068050).

Almost surely, 2^{1813678789503} is an apocalyptic number.

1813678789503 is a deficient number, since it is larger than the sum of its proper divisors (999374027097).

1813678789503 is a wasteful number, since it uses less digits than its factorization.

1813678789503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12337950966 (or 12337950959 counting only the distinct ones).

The product of its (nonzero) digits is 60963840, while the sum is 66.

The spelling of 1813678789503 in words is "one trillion, eight hundred thirteen billion, six hundred seventy-eight million, seven hundred eighty-nine thousand, five hundred three".