27464566721 has 8 divisors (see below), whose sum is σ = 28137485544. Its totient is φ = 26791793280.

The previous prime is 27464566691. The next prime is 27464566757. The reversal of 27464566721 is 12766546472.

It can be written as a sum of positive squares in 4 ways, for example, as 389509696 + 27075057025 = 19736^2 + 164545^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 27464566721 - 2²² = 27460372417 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 27464566721.

It is not an unprimeable number, because it can be changed into a prime (27464566771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 413411 + ... + 475223.

It is an arithmetic number, because the mean of its divisors is an integer number (3517185693).

Almost surely, 2^27464566721 is an apocalyptic number.

It is an amenable number.

27464566721 is a deficient number, since it is larger than the sum of its proper divisors (672918823).

27464566721 is a wasteful number, since it uses less digits than its factorization.

27464566721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72691.

The product of its digits is 3386880, while the sum is 50.

The spelling of 27464566721 in words is "twenty-seven billion, four hundred sixty-four million, five hundred sixty-six thousand, seven hundred twenty-one".