865478503243 has 4 divisors (see below), whose sum is σ = 903108003408. Its totient is φ = 827849003080.

The previous prime is 865478503231. The next prime is 865478503273. The reversal of 865478503243 is 342305874568.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 865478503243 - 2¹³ = 865478495051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (865478503273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18814750048 + ... + 18814750093.

It is an arithmetic number, because the mean of its divisors is an integer number (225777000852).

Almost surely, 2^865478503243 is an apocalyptic number.

865478503243 is a deficient number, since it is larger than the sum of its proper divisors (37629500165).

865478503243 is a wasteful number, since it uses less digits than its factorization.

865478503243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37629500164.

The product of its (nonzero) digits is 19353600, while the sum is 55.

The spelling of 865478503243 in words is "eight hundred sixty-five billion, four hundred seventy-eight million, five hundred three thousand, two hundred forty-three".