71621752056 has 16 divisors (see below), whose sum is σ = 179054380200. Its totient is φ = 23873917344.

The previous prime is 71621752051. The next prime is 71621752067. The reversal of 71621752056 is 65025712617.

It is a happy number.

It is a super-2 number, since 2×71621752056² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 71621751999 and 71621752017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71621752051) 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, 1492119811 + ... + 1492119858.

Almost surely, 2^71621752056 is an apocalyptic number.

It is an amenable number.

71621752056 is an abundant number, since it is smaller than the sum of its proper divisors (107432628144).

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

71621752056 is a wasteful number, since it uses less digits than its factorization.

71621752056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2984239678 (or 2984239674 counting only the distinct ones).

The product of its (nonzero) digits is 176400, while the sum is 42.

The spelling of 71621752056 in words is "seventy-one billion, six hundred twenty-one million, seven hundred fifty-two thousand, fifty-six".