71847485789921 has 8 divisors (see below), whose sum is σ = 72620630635560. Its totient is φ = 71075003171328.

The previous prime is 71847485789909. The next prime is 71847485789941. The reversal of 71847485789921 is 12998758474817.

It can be written as a sum of positive squares in 4 ways, for example, as 29829074560000 + 42018411229921 = 5461600^2 + 6482161^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71847485789921 is a prime.

It is a super-2 number, since 2×71847485789921² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71847485789941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 165338606 + ... + 165772583.

It is an arithmetic number, because the mean of its divisors is an integer number (9077578829445).

Almost surely, 2^{71847485789921} is an apocalyptic number.

It is an amenable number.

71847485789921 is a deficient number, since it is larger than the sum of its proper divisors (773144845639).

71847485789921 is a wasteful number, since it uses less digits than its factorization.

71847485789921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331113523.

The product of its digits is 2275983360, while the sum is 80.

The spelling of 71847485789921 in words is "seventy-one trillion, eight hundred forty-seven billion, four hundred eighty-five million, seven hundred eighty-nine thousand, nine hundred twenty-one".