27666403779 has 16 divisors (see below), whose sum is σ = 42186728448. Its totient is φ = 15798724032.

The previous prime is 27666403769. The next prime is 27666403799. The reversal of 27666403779 is 97730466672.

It is a happy number.

It is not a de Polignac number, because 27666403779 - 2¹¹ = 27666401731 is a prime.

It is not an unprimeable number, because it can be changed into a prime (27666403769) 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 15 ways as a sum of consecutive naturals, for example, 411762 + ... + 474215.

It is an arithmetic number, because the mean of its divisors is an integer number (2636670528).

Almost surely, 2^27666403779 is an apocalyptic number.

27666403779 is a deficient number, since it is larger than the sum of its proper divisors (14520324669).

27666403779 is a wasteful number, since it uses less digits than its factorization.

27666403779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 887474.

The product of its (nonzero) digits is 16003008, while the sum is 57.

The spelling of 27666403779 in words is "twenty-seven billion, six hundred sixty-six million, four hundred three thousand, seven hundred seventy-nine".