27818117128201 has 4 divisors (see below), whose sum is σ = 27818141283712. Its totient is φ = 27818092972692.

The previous prime is 27818117128199. The next prime is 27818117128229. The reversal of 27818117128201 is 10282171181872.

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 27818117128201 - 2¹ = 27818117128199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27818117128001) 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, 10259025 + ... + 12683998.

It is an arithmetic number, because the mean of its divisors is an integer number (6954535320928).

Almost surely, 2^{27818117128201} is an apocalyptic number.

It is an amenable number.

27818117128201 is a deficient number, since it is larger than the sum of its proper divisors (24155511).

27818117128201 is a wasteful number, since it uses less digits than its factorization.

27818117128201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24155510.

The product of its (nonzero) digits is 200704, while the sum is 49.

The spelling of 27818117128201 in words is "twenty-seven trillion, eight hundred eighteen billion, one hundred seventeen million, one hundred twenty-eight thousand, two hundred one".