71520561797 has 8 divisors (see below), whose sum is σ = 73742491680. Its totient is φ = 69324025680.

The previous prime is 71520561781. The next prime is 71520561799. The reversal of 71520561797 is 79716502517.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 71520561797 - 2⁴ = 71520561781 is a prime.

It is a Duffinian number.

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 7 ways as a sum of consecutive naturals, for example, 6342722 + ... + 6353987.

It is an arithmetic number, because the mean of its divisors is an integer number (9217811460).

Almost surely, 2^71520561797 is an apocalyptic number.

It is an amenable number.

71520561797 is a deficient number, since it is larger than the sum of its proper divisors (2221929883).

71520561797 is a wasteful number, since it uses less digits than its factorization.

71520561797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12696883.

The product of its (nonzero) digits is 926100, while the sum is 50.

The spelling of 71520561797 in words is "seventy-one billion, five hundred twenty million, five hundred sixty-one thousand, seven hundred ninety-seven".