27915129129 has 4 divisors (see below), whose sum is σ = 37220172176. Its totient is φ = 18610086084.

The previous prime is 27915129127. The next prime is 27915129161. The reversal of 27915129129 is 92192151972.

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 not a de Polignac number, because 27915129129 - 2¹ = 27915129127 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27915129127) 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, 4652521519 + ... + 4652521524.

It is an arithmetic number, because the mean of its divisors is an integer number (9305043044).

Almost surely, 2^27915129129 is an apocalyptic number.

It is an amenable number.

27915129129 is a deficient number, since it is larger than the sum of its proper divisors (9305043047).

27915129129 is an equidigital number, since it uses as much as digits as its factorization.

27915129129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9305043046.

The product of its digits is 204120, while the sum is 48.

The spelling of 27915129129 in words is "twenty-seven billion, nine hundred fifteen million, one hundred twenty-nine thousand, one hundred twenty-nine".