27705981129 has 4 divisors (see below), whose sum is σ = 36941308176. Its totient is φ = 18470654084.

The previous prime is 27705981119. The next prime is 27705981223. The reversal of 27705981129 is 92118950772.

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 27705981129 - 2⁵ = 27705981097 is a prime.

It is a super-2 number, since 2×27705981129² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (27705981119) 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, 4617663519 + ... + 4617663524.

It is an arithmetic number, because the mean of its divisors is an integer number (9235327044).

Almost surely, 2^27705981129 is an apocalyptic number.

It is an amenable number.

27705981129 is a deficient number, since it is larger than the sum of its proper divisors (9235327047).

27705981129 is an equidigital number, since it uses as much as digits as its factorization.

27705981129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9235327046.

The product of its (nonzero) digits is 635040, while the sum is 51.

The spelling of 27705981129 in words is "twenty-seven billion, seven hundred five million, nine hundred eighty-one thousand, one hundred twenty-nine".