27193271661 has 6 divisors (see below), whose sum is σ = 39279170190. Its totient is φ = 18128847768.

The previous prime is 27193271659. The next prime is 27193271687. The reversal of 27193271661 is 16617239172.

It can be written as a sum of positive squares in only one way, i.e., 14204110761 + 12989160900 = 119181^2 + 113970^2 .

It is not a de Polignac number, because 27193271661 - 2¹ = 27193271659 is a prime.

It is a super-3 number, since 3×27193271661³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27193271461) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1510737306 + ... + 1510737323.

It is an arithmetic number, because the mean of its divisors is an integer number (6546528365).

Almost surely, 2^27193271661 is an apocalyptic number.

It is an amenable number.

27193271661 is a deficient number, since it is larger than the sum of its proper divisors (12085898529).

27193271661 is a wasteful number, since it uses less digits than its factorization.

27193271661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3021474635 (or 3021474632 counting only the distinct ones).

The product of its digits is 190512, while the sum is 45.

The spelling of 27193271661 in words is "twenty-seven billion, one hundred ninety-three million, two hundred seventy-one thousand, six hundred sixty-one".