27765501009 has 4 divisors (see below), whose sum is σ = 37020668016. Its totient is φ = 18510334004.

The previous prime is 27765500993. The next prime is 27765501019. The reversal of 27765501009 is 90010556772.

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 27765501009 - 2⁴ = 27765500993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (27765501019) 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, 4627583499 + ... + 4627583504.

It is an arithmetic number, because the mean of its divisors is an integer number (9255167004).

Almost surely, 2^27765501009 is an apocalyptic number.

It is an amenable number.

27765501009 is a deficient number, since it is larger than the sum of its proper divisors (9255167007).

27765501009 is an equidigital number, since it uses as much as digits as its factorization.

27765501009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9255167006.

The product of its (nonzero) digits is 132300, while the sum is 42.

The spelling of 27765501009 in words is "twenty-seven billion, seven hundred sixty-five million, five hundred one thousand, nine".