27156405663 has 12 divisors (see below), whose sum is σ = 39230301240. Its totient is φ = 18102248016.

The previous prime is 27156405611. The next prime is 27156405673. The reversal of 27156405663 is 36650465172.

27156405663 is a `hidden beast` number, since 27 + 1 + 5 + 64 + 0 + 566 + 3 = 666.

It is not a de Polignac number, because 27156405663 - 2⁸ = 27156405407 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27156405673) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 81108 + ... + 246761.

It is an arithmetic number, because the mean of its divisors is an integer number (3269191770).

Almost surely, 2^27156405663 is an apocalyptic number.

27156405663 is a deficient number, since it is larger than the sum of its proper divisors (12073895577).

27156405663 is a wasteful number, since it uses less digits than its factorization.

27156405663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337078 (or 337075 counting only the distinct ones).

The product of its (nonzero) digits is 907200, while the sum is 45.

The spelling of 27156405663 in words is "twenty-seven billion, one hundred fifty-six million, four hundred five thousand, six hundred sixty-three".