27546378121 has 4 divisors (see below), whose sum is σ = 28218241044. Its totient is φ = 26874515200.

The previous prime is 27546378113. The next prime is 27546378143. The reversal of 27546378121 is 12187364572.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5203602496 + 22342775625 = 72136^2 + 149475^2 .

It is a cyclic number.

It is not a de Polignac number, because 27546378121 - 2³ = 27546378113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27546358121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 335931400 + ... + 335931481.

It is an arithmetic number, because the mean of its divisors is an integer number (7054560261).

Almost surely, 2^27546378121 is an apocalyptic number.

It is an amenable number.

27546378121 is a deficient number, since it is larger than the sum of its proper divisors (671862923).

27546378121 is an equidigital number, since it uses as much as digits as its factorization.

27546378121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 671862922.

The product of its digits is 564480, while the sum is 46.

The spelling of 27546378121 in words is "twenty-seven billion, five hundred forty-six million, three hundred seventy-eight thousand, one hundred twenty-one".