71530334721 has 24 divisors (see below), whose sum is σ = 110811654720. Its totient is φ = 44324650656.

The previous prime is 71530334609. The next prime is 71530334737. The reversal of 71530334721 is 12743303517.

71530334721 is a `hidden beast` number, since 7 + 1 + 5 + 303 + 347 + 2 + 1 = 666.

It is not a de Polignac number, because 71530334721 - 2⁷ = 71530334593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71530334741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3937221 + ... + 3955346.

It is an arithmetic number, because the mean of its divisors is an integer number (4617152280).

Almost surely, 2^71530334721 is an apocalyptic number.

It is an amenable number.

71530334721 is a deficient number, since it is larger than the sum of its proper divisors (39281319999).

71530334721 is a wasteful number, since it uses less digits than its factorization.

71530334721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7892645 (or 7892642 counting only the distinct ones).

The product of its (nonzero) digits is 52920, while the sum is 36.

The spelling of 71530334721 in words is "seventy-one billion, five hundred thirty million, three hundred thirty-four thousand, seven hundred twenty-one".