71515865715 has 64 divisors (see below), whose sum is σ = 135605007360. Its totient is φ = 31490081280.

The previous prime is 71515865699. The next prime is 71515865747. The reversal of 71515865715 is 51756851517.

It is a happy number.

It is not a de Polignac number, because 71515865715 - 2⁴ = 71515865699 is a prime.

It is a super-2 number, since 2×71515865715² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 1254052 + ... + 1309838.

It is an arithmetic number, because the mean of its divisors is an integer number (2118828240).

Almost surely, 2^71515865715 is an apocalyptic number.

71515865715 is a deficient number, since it is larger than the sum of its proper divisors (64089141645).

71515865715 is a wasteful number, since it uses less digits than its factorization.

71515865715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56252.

The product of its digits is 1470000, while the sum is 51.

The spelling of 71515865715 in words is "seventy-one billion, five hundred fifteen million, eight hundred sixty-five thousand, seven hundred fifteen".