27138617655 has 16 divisors (see below), whose sum is σ = 43481044320. Its totient is φ = 14454177408.

The previous prime is 27138617603. The next prime is 27138617699. The reversal of 27138617655 is 55671683172.

It is not a de Polignac number, because 27138617655 - 2⁶ = 27138617591 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 27138617598 and 27138617607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1223140 + ... + 1245129.

It is an arithmetic number, because the mean of its divisors is an integer number (2717565270).

Almost surely, 2^27138617655 is an apocalyptic number.

27138617655 is a deficient number, since it is larger than the sum of its proper divisors (16342426665).

27138617655 is a wasteful number, since it uses less digits than its factorization.

27138617655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2469010.

The product of its digits is 2116800, while the sum is 51.

The spelling of 27138617655 in words is "twenty-seven billion, one hundred thirty-eight million, six hundred seventeen thousand, six hundred fifty-five".