71521510000 has 200 divisors, whose sum is σ = 182978990480. Its totient is φ = 26998272000.

The previous prime is 71521509977. The next prime is 71521510001. The reversal of 71521510000 is 1512517.

It is a tau number, because it is divible by the number of its divisors (200).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71521510001) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 64029442 + ... + 64030558.

Almost surely, 2^71521510000 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71521510000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91489495240).

71521510000 is an abundant number, since it is smaller than the sum of its proper divisors (111457480480).

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

71521510000 is a wasteful number, since it uses less digits than its factorization.

71521510000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1501 (or 1480 counting only the distinct ones).

The product of its (nonzero) digits is 350, while the sum is 22.

The spelling of 71521510000 in words is "seventy-one billion, five hundred twenty-one million, five hundred ten thousand".