71564788515 has 64 divisors (see below), whose sum is σ = 129097027584. Its totient is φ = 33538560000.

The previous prime is 71564788513. The next prime is 71564788553. The reversal of 71564788515 is 51588746517.

It is not a de Polignac number, because 71564788515 - 2¹ = 71564788513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71564788513) 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 63 ways as a sum of consecutive naturals, for example, 4498375 + ... + 4514255.

It is an arithmetic number, because the mean of its divisors is an integer number (2017141056).

Almost surely, 2^71564788515 is an apocalyptic number.

71564788515 is a deficient number, since it is larger than the sum of its proper divisors (57532239069).

71564788515 is a wasteful number, since it uses less digits than its factorization.

71564788515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16812.

The product of its digits is 9408000, while the sum is 57.

The spelling of 71564788515 in words is "seventy-one billion, five hundred sixty-four million, seven hundred eighty-eight thousand, five hundred fifteen".