27664021277 has 4 divisors (see below), whose sum is σ = 27779770560. Its totient is φ = 27548271996.

The previous prime is 27664021271. The next prime is 27664021283. The reversal of 27664021277 is 77212046672.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (27664021271) and next prime (27664021283).

It is a cyclic number.

It is not a de Polignac number, because 27664021277 - 2²⁴ = 27647244061 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 (27664021271) 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, 57874283 + ... + 57874760.

It is an arithmetic number, because the mean of its divisors is an integer number (6944942640).

Almost surely, 2^27664021277 is an apocalyptic number.

It is an amenable number.

27664021277 is a deficient number, since it is larger than the sum of its proper divisors (115749283).

27664021277 is a wasteful number, since it uses less digits than its factorization.

27664021277 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115749282.

The product of its (nonzero) digits is 395136, while the sum is 44.

The spelling of 27664021277 in words is "twenty-seven billion, six hundred sixty-four million, twenty-one thousand, two hundred seventy-seven".