1815013371373 has 2 divisors, whose sum is σ = 1815013371374. Its totient is φ = 1815013371372.

The previous prime is 1815013371313. The next prime is 1815013371439. The reversal of 1815013371373 is 3731733105181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1453285703529 + 361727667844 = 1205523^2 + 601438^2 .

It is a cyclic number.

It is not a de Polignac number, because 1815013371373 - 2²¹ = 1815011274221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1815013371313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 907506685686 + 907506685687.

It is an arithmetic number, because the mean of its divisors is an integer number (907506685687).

Almost surely, 2^{1815013371373} is an apocalyptic number.

It is an amenable number.

1815013371373 is a deficient number, since it is larger than the sum of its proper divisors (1).

1815013371373 is an equidigital number, since it uses as much as digits as its factorization.

1815013371373 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 158760, while the sum is 43.

The spelling of 1815013371373 in words is "one trillion, eight hundred fifteen billion, thirteen million, three hundred seventy-one thousand, three hundred seventy-three".