27254617661 has 4 divisors (see below), whose sum is σ = 27392966172. Its totient is φ = 27116269152.

The previous prime is 27254617633. The next prime is 27254617667. The reversal of 27254617661 is 16671645272.

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 12993720100 + 14260897561 = 113990^2 + 119419^2 .

It is a cyclic number.

It is not a de Polignac number, because 27254617661 - 2²⁶ = 27187508797 is a prime.

It is a super-2 number, since 2×27254617661² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27254617667) 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, 69173960 + ... + 69174353.

It is an arithmetic number, because the mean of its divisors is an integer number (6848241543).

Almost surely, 2^27254617661 is an apocalyptic number.

It is an amenable number.

27254617661 is a deficient number, since it is larger than the sum of its proper divisors (138348511).

27254617661 is a wasteful number, since it uses less digits than its factorization.

27254617661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138348510.

The product of its digits is 846720, while the sum is 47.

The spelling of 27254617661 in words is "twenty-seven billion, two hundred fifty-four million, six hundred seventeen thousand, six hundred sixty-one".