71212506806 has 32 divisors (see below), whose sum is σ = 128527392000. Its totient is φ = 28908034272.

The previous prime is 71212506797. The next prime is 71212506817. The reversal of 71212506806 is 60860521217.

It is a super-2 number, since 2×71212506806² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 71212506806.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 1635425 + ... + 1678403.

It is an arithmetic number, because the mean of its divisors is an integer number (4016481000).

Almost surely, 2^71212506806 is an apocalyptic number.

71212506806 is a deficient number, since it is larger than the sum of its proper divisors (57314885194).

71212506806 is a wasteful number, since it uses less digits than its factorization.

71212506806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49236.

The product of its (nonzero) digits is 40320, while the sum is 38.

The spelling of 71212506806 in words is "seventy-one billion, two hundred twelve million, five hundred six thousand, eight hundred six".