27205138081 has 4 divisors (see below), whose sum is σ = 29678332464. Its totient is φ = 24731943700.

The previous prime is 27205138057. The next prime is 27205138099. The reversal of 27205138081 is 18083150272.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 27205138081 - 2¹¹ = 27205136033 is a prime.

It is a super-2 number, since 2×27205138081² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 27205138081.

It is not an unprimeable number, because it can be changed into a prime (27205130081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1236597175 + ... + 1236597196.

It is an arithmetic number, because the mean of its divisors is an integer number (7419583116).

Almost surely, 2^27205138081 is an apocalyptic number.

It is an amenable number.

27205138081 is a deficient number, since it is larger than the sum of its proper divisors (2473194383).

27205138081 is a wasteful number, since it uses less digits than its factorization.

27205138081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2473194382.

The product of its (nonzero) digits is 26880, while the sum is 37.

The spelling of 27205138081 in words is "twenty-seven billion, two hundred five million, one hundred thirty-eight thousand, eighty-one".