27666403778 has 64 divisors (see below), whose sum is σ = 46889321472. Its totient is φ = 12156099840.

The previous prime is 27666403769. The next prime is 27666403799. The reversal of 27666403778 is 87730466672.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18530000 + ... + 18531492.

It is an arithmetic number, because the mean of its divisors is an integer number (732645648).

Almost surely, 2^27666403778 is an apocalyptic number.

27666403778 is a deficient number, since it is larger than the sum of its proper divisors (19222917694).

27666403778 is a wasteful number, since it uses less digits than its factorization.

27666403778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1899.

The product of its (nonzero) digits is 14224896, while the sum is 56.

The spelling of 27666403778 in words is "twenty-seven billion, six hundred sixty-six million, four hundred three thousand, seven hundred seventy-eight".