871625538477 has 20 divisors (see below), whose sum is σ = 1302861343036. Its totient is φ = 580725132480.

The previous prime is 871625538467. The next prime is 871625538499. The reversal of 871625538477 is 774835526178.

It is a happy number.

871625538477 is a `hidden beast` number, since 8 + 7 + 1 + 6 + 2 + 553 + 8 + 4 + 77 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 809254971396 + 62370567081 = 899586^2 + 249741^2 .

It is not a de Polignac number, because 871625538477 - 2⁷ = 871625538349 is a prime.

It is a super-3 number, since 3×871625538477³ (a number of 37 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (871625538467) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3187888 + ... + 3450489.

Almost surely, 2^871625538477 is an apocalyptic number.

It is an amenable number.

871625538477 is a deficient number, since it is larger than the sum of its proper divisors (431235804559).

871625538477 is a wasteful number, since it uses less digits than its factorization.

871625538477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6640010 (or 6640001 counting only the distinct ones).

The product of its digits is 79027200, while the sum is 63.

The spelling of 871625538477 in words is "eight hundred seventy-one billion, six hundred twenty-five million, five hundred thirty-eight thousand, four hundred seventy-seven".