27750765661 has 8 divisors (see below), whose sum is σ = 28053422784. Its totient is φ = 27449110080.

The previous prime is 27750765631. The next prime is 27750765673. The reversal of 27750765661 is 16656705772.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 27750765661 - 2⁹ = 27750765149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 27750765599 and 27750765608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27750765631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 194601 + ... + 305566.

It is an arithmetic number, because the mean of its divisors is an integer number (3506677848).

Almost surely, 2^27750765661 is an apocalyptic number.

It is an amenable number.

27750765661 is a deficient number, since it is larger than the sum of its proper divisors (302657123).

27750765661 is a wasteful number, since it uses less digits than its factorization.

27750765661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500771.

The product of its (nonzero) digits is 3704400, while the sum is 52.

The spelling of 27750765661 in words is "twenty-seven billion, seven hundred fifty million, seven hundred sixty-five thousand, six hundred sixty-one".