71218247172 has 48 divisors (see below), whose sum is σ = 171593490432. Its totient is φ = 22965985440.

The previous prime is 71218247147. The next prime is 71218247209. The reversal of 71218247172 is 27174281217.

It is a super-3 number, since 3×71218247172³ (a number of 34 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1146373 + ... + 1206899.

It is an arithmetic number, because the mean of its divisors is an integer number (3574864384).

Almost surely, 2^71218247172 is an apocalyptic number.

It is an amenable number.

71218247172 is an abundant number, since it is smaller than the sum of its proper divisors (100375243260).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71218247172 is a wasteful number, since it uses less digits than its factorization.

71218247172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63728 (or 63726 counting only the distinct ones).

The product of its digits is 87808, while the sum is 42.

The spelling of 71218247172 in words is "seventy-one billion, two hundred eighteen million, two hundred forty-seven thousand, one hundred seventy-two".