27661580029 has 4 divisors (see below), whose sum is σ = 27814406620. Its totient is φ = 27508753440.

The previous prime is 27661579963. The next prime is 27661580041. The reversal of 27661580029 is 92008516672.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7430784804 + 20230795225 = 86202^2 + 142235^2 .

It is a cyclic number.

It is not a de Polignac number, because 27661580029 - 2¹⁷ = 27661448957 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 (27661580099) 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, 76413024 + ... + 76413385.

It is an arithmetic number, because the mean of its divisors is an integer number (6953601655).

Almost surely, 2^27661580029 is an apocalyptic number.

It is an amenable number.

27661580029 is a deficient number, since it is larger than the sum of its proper divisors (152826591).

27661580029 is a wasteful number, since it uses less digits than its factorization.

27661580029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152826590.

The product of its (nonzero) digits is 362880, while the sum is 46.

The spelling of 27661580029 in words is "twenty-seven billion, six hundred sixty-one million, five hundred eighty thousand, twenty-nine".