71561780057112 has 32 divisors (see below), whose sum is σ = 178906381512000. Its totient is φ = 23853669169824.

The previous prime is 71561780056973. The next prime is 71561780057123. The reversal of 71561780057112 is 21175008716517.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13818718 + ... + 18277869.

It is an arithmetic number, because the mean of its divisors is an integer number (5590824422250).

Almost surely, 2^{71561780057112} is an apocalyptic number.

It is an amenable number.

71561780057112 is an abundant number, since it is smaller than the sum of its proper divisors (107344601454888).

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

71561780057112 is a wasteful number, since it uses less digits than its factorization.

71561780057112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32189495 (or 32189491 counting only the distinct ones).

The product of its (nonzero) digits is 823200, while the sum is 51.

The spelling of 71561780057112 in words is "seventy-one trillion, five hundred sixty-one billion, seven hundred eighty million, fifty-seven thousand, one hundred twelve".