871259767721 has 4 divisors (see below), whose sum is σ = 995725448832. Its totient is φ = 746794086612.

The previous prime is 871259767711. The next prime is 871259767727. The reversal of 871259767721 is 127767952178.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 871259767721 - 2¹⁸ = 871259505577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (871259767727) 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, 62232840545 + ... + 62232840558.

It is an arithmetic number, because the mean of its divisors is an integer number (248931362208).

Almost surely, 2^871259767721 is an apocalyptic number.

It is an amenable number.

871259767721 is a deficient number, since it is larger than the sum of its proper divisors (124465681111).

871259767721 is a wasteful number, since it uses less digits than its factorization.

871259767721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124465681110.

The product of its digits is 20744640, while the sum is 62.

The spelling of 871259767721 in words is "eight hundred seventy-one billion, two hundred fifty-nine million, seven hundred sixty-seven thousand, seven hundred twenty-one".