871808211772 has 12 divisors (see below), whose sum is σ = 1529187847936. Its totient is φ = 434897398080.

The previous prime is 871808211751. The next prime is 871808211787. The reversal of 871808211772 is 277112808178.

It is a super-2 number, since 2×871808211772² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 251675004 + ... + 251678467.

Almost surely, 2^871808211772 is an apocalyptic number.

It is an amenable number.

871808211772 is a deficient number, since it is larger than the sum of its proper divisors (657379636164).

871808211772 is a wasteful number, since it uses less digits than its factorization.

871808211772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503353908 (or 503353906 counting only the distinct ones).

The product of its (nonzero) digits is 702464, while the sum is 52.

The spelling of 871808211772 in words is "eight hundred seventy-one billion, eight hundred eight million, two hundred eleven thousand, seven hundred seventy-two".