813865857963 has 8 divisors (see below), whose sum is σ = 1093438099776. Its totient is φ = 538435427400.

The previous prime is 813865857929. The next prime is 813865857977. The reversal of 813865857963 is 369758568318.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-813865857963 is a prime.

It is not an unprimeable number, because it can be changed into a prime (813865857163) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1035452353 + ... + 1035453138.

It is an arithmetic number, because the mean of its divisors is an integer number (136679762472).

Almost surely, 2^813865857963 is an apocalyptic number.

813865857963 is a deficient number, since it is larger than the sum of its proper divisors (279572241813).

813865857963 is a wasteful number, since it uses less digits than its factorization.

813865857963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2070905625.

The product of its digits is 261273600, while the sum is 69.

The spelling of 813865857963 in words is "eight hundred thirteen billion, eight hundred sixty-five million, eight hundred fifty-seven thousand, nine hundred sixty-three".