71520734057 has 4 divisors (see below), whose sum is σ = 71525051136. Its totient is φ = 71516416980.

The previous prime is 71520734041. The next prime is 71520734099. The reversal of 71520734057 is 75043702517.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 71520734057 - 2⁴ = 71520734041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71520739057) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2133593 + ... + 2166854.

It is an arithmetic number, because the mean of its divisors is an integer number (17881262784).

Almost surely, 2^71520734057 is an apocalyptic number.

It is an amenable number.

71520734057 is a deficient number, since it is larger than the sum of its proper divisors (4317079).

71520734057 is a wasteful number, since it uses less digits than its factorization.

71520734057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4317078.

The product of its (nonzero) digits is 205800, while the sum is 41.

The spelling of 71520734057 in words is "seventy-one billion, five hundred twenty million, seven hundred thirty-four thousand, fifty-seven".