27064640261 has 4 divisors (see below), whose sum is σ = 27065176524. Its totient is φ = 27064104000.

The previous prime is 27064640233. The next prime is 27064640299. The reversal of 27064640261 is 16204646072.

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 18192884161 + 8871756100 = 134881^2 + 94190^2 .

It is a cyclic number.

It is not a de Polignac number, because 27064640261 - 2³⁴ = 9884771077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27064643261) 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, 183530 + ... + 296331.

It is an arithmetic number, because the mean of its divisors is an integer number (6766294131).

Almost surely, 2^27064640261 is an apocalyptic number.

It is an amenable number.

27064640261 is a deficient number, since it is larger than the sum of its proper divisors (536263).

27064640261 is an equidigital number, since it uses as much as digits as its factorization.

27064640261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536262.

The product of its (nonzero) digits is 96768, while the sum is 38.

The spelling of 27064640261 in words is "twenty-seven billion, sixty-four million, six hundred forty thousand, two hundred sixty-one".