871564077871 has 4 divisors (see below), whose sum is σ = 872999933632. Its totient is φ = 870128222112.

The previous prime is 871564077847. The next prime is 871564077899. The reversal of 871564077871 is 178770465178.

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 871564077871 - 2⁹ = 871564077359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (871564017871) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 717926970 + ... + 717928183.

It is an arithmetic number, because the mean of its divisors is an integer number (218249983408).

Almost surely, 2^871564077871 is an apocalyptic number.

871564077871 is a deficient number, since it is larger than the sum of its proper divisors (1435855761).

871564077871 is a wasteful number, since it uses less digits than its factorization.

871564077871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1435855760.

The product of its (nonzero) digits is 18439680, while the sum is 61.

The spelling of 871564077871 in words is "eight hundred seventy-one billion, five hundred sixty-four million, seventy-seven thousand, eight hundred seventy-one".