27971224517 has 8 divisors (see below), whose sum is σ = 29011635192. Its totient is φ = 26945784000.

The previous prime is 27971224513. The next prime is 27971224537. The reversal of 27971224517 is 71542217972.

It is a Cunningham number, because it is equal to 167246²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 25029138436 + 2942086081 = 158206^2 + 54241^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 27971224517 - 2² = 27971224513 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27971224513) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3738734 + ... + 3746207.

It is an arithmetic number, because the mean of its divisors is an integer number (3626454399).

Almost surely, 2^27971224517 is an apocalyptic number.

It is an amenable number.

27971224517 is a deficient number, since it is larger than the sum of its proper divisors (1040410675).

27971224517 is a wasteful number, since it uses less digits than its factorization.

27971224517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7485079.

The product of its digits is 493920, while the sum is 47.

The spelling of 27971224517 in words is "twenty-seven billion, nine hundred seventy-one million, two hundred twenty-four thousand, five hundred seventeen".