71660660720 has 80 divisors (see below), whose sum is σ = 181797873120. Its totient is φ = 26052633600.

The previous prime is 71660660651. The next prime is 71660660783. The reversal of 71660660720 is 2706606617.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7412690 + ... + 7422350.

It is an arithmetic number, because the mean of its divisors is an integer number (2272473414).

Almost surely, 2^71660660720 is an apocalyptic number.

It is an amenable number.

71660660720 is an abundant number, since it is smaller than the sum of its proper divisors (110137212400).

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

71660660720 is a wasteful number, since it uses less digits than its factorization.

71660660720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18114 (or 18108 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 41.

The spelling of 71660660720 in words is "seventy-one billion, six hundred sixty million, six hundred sixty thousand, seven hundred twenty".