71552505520 has 20 divisors (see below), whose sum is σ = 166359575520. Its totient is φ = 28621002176.

The previous prime is 71552505491. The next prime is 71552505547. The reversal of 71552505520 is 2550525517.

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

It is a super-2 number, since 2×71552505520² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 71552505520.

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, 447203080 + ... + 447203239.

It is an arithmetic number, because the mean of its divisors is an integer number (8317978776).

Almost surely, 2^71552505520 is an apocalyptic number.

It is an amenable number.

71552505520 is an abundant number, since it is smaller than the sum of its proper divisors (94807070000).

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

71552505520 is a wasteful number, since it uses less digits than its factorization.

71552505520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 894406332 (or 894406326 counting only the distinct ones).

The product of its (nonzero) digits is 87500, while the sum is 37.

The spelling of 71552505520 in words is "seventy-one billion, five hundred fifty-two million, five hundred five thousand, five hundred twenty".