71561800436 has 12 divisors (see below), whose sum is σ = 143123600928. Its totient is φ = 30669343032.

The previous prime is 71561800417. The next prime is 71561800459. The reversal of 71561800436 is 63400816517.

71561800436 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 71561800393 and 71561800402.

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, 1277889266 + ... + 1277889321.

It is an arithmetic number, because the mean of its divisors is an integer number (11926966744).

Almost surely, 2^71561800436 is an apocalyptic number.

It is an amenable number.

71561800436 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71561800436 is a wasteful number, since it uses less digits than its factorization.

71561800436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2555778598 (or 2555778596 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 41.

The spelling of 71561800436 in words is "seventy-one billion, five hundred sixty-one million, eight hundred thousand, four hundred thirty-six".