27617707981 has 4 divisors (see below), whose sum is σ = 27626883264. Its totient is φ = 27608532700.

The previous prime is 27617707979. The next prime is 27617707993. The reversal of 27617707981 is 18970771672.

It is a happy number.

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 cyclic number.

It is not a de Polignac number, because 27617707981 - 2¹ = 27617707979 is a prime.

It is a super-2 number, since 2×27617707981² (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 (27617707681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4583125 + ... + 4589146.

It is an arithmetic number, because the mean of its divisors is an integer number (6906720816).

Almost surely, 2^27617707981 is an apocalyptic number.

It is an amenable number.

27617707981 is a deficient number, since it is larger than the sum of its proper divisors (9175283).

27617707981 is an equidigital number, since it uses as much as digits as its factorization.

27617707981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9175282.

The product of its (nonzero) digits is 2074464, while the sum is 55.

The spelling of 27617707981 in words is "twenty-seven billion, six hundred seventeen million, seven hundred seven thousand, nine hundred eighty-one".