71564788481 has 4 divisors (see below), whose sum is σ = 71591725572. Its totient is φ = 71537851392.

The previous prime is 71564788439. The next prime is 71564788487. The reversal of 71564788481 is 18488746517.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18488746517 = 41 ⋅450945037.

It can be written as a sum of positive squares in 2 ways, for example, as 45582250000 + 25982538481 = 213500^2 + 161191^2 .

It is a cyclic number.

It is not a de Polignac number, because 71564788481 - 2¹⁸ = 71564526337 is a prime.

It is a super-2 number, since 2×71564788481² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71564788481.

It is not an unprimeable number, because it can be changed into a prime (71564788487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13464560 + ... + 13469873.

It is an arithmetic number, because the mean of its divisors is an integer number (17897931393).

Almost surely, 2^71564788481 is an apocalyptic number.

It is an amenable number.

71564788481 is a deficient number, since it is larger than the sum of its proper divisors (26937091).

71564788481 is a wasteful number, since it uses less digits than its factorization.

71564788481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26937090.

The product of its digits is 12042240, while the sum is 59.

The spelling of 71564788481 in words is "seventy-one billion, five hundred sixty-four million, seven hundred eighty-eight thousand, four hundred eighty-one".