27305761671721 has 4 divisors (see below), whose sum is σ = 29406204877252. Its totient is φ = 25205318466192.

The previous prime is 27305761671607. The next prime is 27305761671751. The reversal of 27305761671721 is 12717616750372.

It is a happy number.

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 18599691805696 + 8706069866025 = 4312736^2 + 2950605^2 .

It is a cyclic number.

It is not a de Polignac number, because 27305761671721 - 2⁷ = 27305761671593 is a prime.

It is a super-2 number, since 2×27305761671721² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27305761671751) 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, 1050221602746 + ... + 1050221602771.

It is an arithmetic number, because the mean of its divisors is an integer number (7351551219313).

Almost surely, 2^{27305761671721} is an apocalyptic number.

It is an amenable number.

27305761671721 is a deficient number, since it is larger than the sum of its proper divisors (2100443205531).

27305761671721 is a wasteful number, since it uses less digits than its factorization.

27305761671721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2100443205530.

The product of its (nonzero) digits is 5186160, while the sum is 55.

The spelling of 27305761671721 in words is "twenty-seven trillion, three hundred five billion, seven hundred sixty-one million, six hundred seventy-one thousand, seven hundred twenty-one".