71866696081 has 4 divisors (see below), whose sum is σ = 71886024000. Its totient is φ = 71847368164.

The previous prime is 71866696079. The next prime is 71866696117. The reversal of 71866696081 is 18069666817.

It is a happy number.

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 71866696081 - 2¹ = 71866696079 is a prime.

It is a super-2 number, since 2×71866696081² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71866696481) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 9658381 + ... + 9665818.

It is an arithmetic number, because the mean of its divisors is an integer number (17971506000).

Almost surely, 2^71866696081 is an apocalyptic number.

It is an amenable number.

71866696081 is a deficient number, since it is larger than the sum of its proper divisors (19327919).

71866696081 is a wasteful number, since it uses less digits than its factorization.

71866696081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19327918.

The product of its (nonzero) digits is 5225472, while the sum is 58.

The spelling of 71866696081 in words is "seventy-one billion, eight hundred sixty-six million, six hundred ninety-six thousand, eighty-one".