71015979920 has 20 divisors (see below), whose sum is σ = 165112153500. Its totient is φ = 28406391936.

The previous prime is 71015979901. The next prime is 71015979971. The reversal of 71015979920 is 2997951017.

It can be written as a sum of positive squares in 2 ways, for example, as 21092333824 + 49923646096 = 145232^2 + 223436^2 .

It is a tau number, because it is divible by the number of its divisors (20).

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, 443849795 + ... + 443849954.

It is an arithmetic number, because the mean of its divisors is an integer number (8255607675).

Almost surely, 2^71015979920 is an apocalyptic number.

It is an amenable number.

71015979920 is an abundant number, since it is smaller than the sum of its proper divisors (94096173580).

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

71015979920 is a wasteful number, since it uses less digits than its factorization.

71015979920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 887699762 (or 887699756 counting only the distinct ones).

The product of its (nonzero) digits is 357210, while the sum is 50.

The spelling of 71015979920 in words is "seventy-one billion, fifteen million, nine hundred seventy-nine thousand, nine hundred twenty".