871640247715 has 4 divisors (see below), whose sum is σ = 1045968297264. Its totient is φ = 697312198168.

The previous prime is 871640247701. The next prime is 871640247773. The reversal of 871640247715 is 517742046178.

It is a happy number.

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 871640247715 - 2¹⁷ = 871640116643 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87164024767 + ... + 87164024776.

It is an arithmetic number, because the mean of its divisors is an integer number (261492074316).

Almost surely, 2^871640247715 is an apocalyptic number.

871640247715 is a deficient number, since it is larger than the sum of its proper divisors (174328049549).

871640247715 is a wasteful number, since it uses less digits than its factorization.

871640247715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174328049548.

The product of its (nonzero) digits is 2634240, while the sum is 52.

The spelling of 871640247715 in words is "eight hundred seventy-one billion, six hundred forty million, two hundred forty-seven thousand, seven hundred fifteen".