1815997496373 has 12 divisors (see below), whose sum is σ = 2623506410668. Its totient is φ = 1210480882560.

The previous prime is 1815997496293. The next prime is 1815997496437. The reversal of 1815997496373 is 3736947995181.

1815997496373 is a `hidden beast` number, since 1 + 8 + 15 + 9 + 97 + 496 + 37 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1542780115569 + 273217380804 = 1242087^2 + 522702^2 .

It is not a de Polignac number, because 1815997496373 - 2¹⁰ = 1815997495349 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 (1815997496473) 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, 15280438 + ... + 15398823.

Almost surely, 2^{1815997496373} is an apocalyptic number.

It is an amenable number.

1815997496373 is a deficient number, since it is larger than the sum of its proper divisors (807508914295).

1815997496373 is a wasteful number, since it uses less digits than its factorization.

1815997496373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30685844 (or 30685841 counting only the distinct ones).

The product of its digits is 308629440, while the sum is 72.

The spelling of 1815997496373 in words is "one trillion, eight hundred fifteen billion, nine hundred ninety-seven million, four hundred ninety-six thousand, three hundred seventy-three".