71520561798 has 48 divisors (see below), whose sum is σ = 166995669744. Its totient is φ = 20360652480.

The previous prime is 71520561781. The next prime is 71520561799. The reversal of 71520561798 is 89716502517.

It is a self number, because there is not a number n which added to its sum of digits gives 71520561798.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71520561799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 357673 + ... + 520548.

It is an arithmetic number, because the mean of its divisors is an integer number (3479076453).

Almost surely, 2^71520561798 is an apocalyptic number.

71520561798 is an abundant number, since it is smaller than the sum of its proper divisors (95475107946).

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

71520561798 is a wasteful number, since it uses less digits than its factorization.

71520561798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 878517 (or 878510 counting only the distinct ones).

The product of its (nonzero) digits is 1058400, while the sum is 51.

The spelling of 71520561798 in words is "seventy-one billion, five hundred twenty million, five hundred sixty-one thousand, seven hundred ninety-eight".