27961331717 has 4 divisors (see below), whose sum is σ = 30503270976. Its totient is φ = 25419392460.

The previous prime is 27961331687. The next prime is 27961331729. The reversal of 27961331717 is 71713316972.

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 de Polignac number, because none of the positive numbers 2^k-27961331717 is a prime.

It is a super-2 number, since 2×27961331717² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27961331777) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1270969613 + ... + 1270969634.

It is an arithmetic number, because the mean of its divisors is an integer number (7625817744).

Almost surely, 2^27961331717 is an apocalyptic number.

It is an amenable number.

27961331717 is a deficient number, since it is larger than the sum of its proper divisors (2541939259).

27961331717 is a wasteful number, since it uses less digits than its factorization.

27961331717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2541939258.

The product of its digits is 333396, while the sum is 47.

The spelling of 27961331717 in words is "twenty-seven billion, nine hundred sixty-one million, three hundred thirty-one thousand, seven hundred seventeen".