813534336243 has 24 divisors (see below), whose sum is σ = 1195631148816. Its totient is φ = 532901476800.

The previous prime is 813534336239. The next prime is 813534336283. The reversal of 813534336243 is 342633435318.

813534336243 is a `hidden beast` number, since 8 + 1 + 35 + 343 + 36 + 243 = 666.

It is not a de Polignac number, because 813534336243 - 2² = 813534336239 is a prime.

It is not an unprimeable number, because it can be changed into a prime (813534336233) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 262488 + ... + 1302293.

It is an arithmetic number, because the mean of its divisors is an integer number (49817964534).

Almost surely, 2^813534336243 is an apocalyptic number.

813534336243 is a deficient number, since it is larger than the sum of its proper divisors (382096812573).

813534336243 is a wasteful number, since it uses less digits than its factorization.

813534336243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1565795 (or 1565792 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 45.

The spelling of 813534336243 in words is "eight hundred thirteen billion, five hundred thirty-four million, three hundred thirty-six thousand, two hundred forty-three".