27505904138 has 4 divisors (see below), whose sum is σ = 41258856210. Its totient is φ = 13752952068.

The previous prime is 27505904113. The next prime is 27505904147. The reversal of 27505904138 is 83140950572.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 14111776849 + 13394127289 = 118793^2 + 115733^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6876476033 + ... + 6876476036.

Almost surely, 2^27505904138 is an apocalyptic number.

27505904138 is a deficient number, since it is larger than the sum of its proper divisors (13752952072).

27505904138 is a wasteful number, since it uses less digits than its factorization.

27505904138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13752952071.

The product of its (nonzero) digits is 302400, while the sum is 44.

The spelling of 27505904138 in words is "twenty-seven billion, five hundred five million, nine hundred four thousand, one hundred thirty-eight".