27664022557 has 8 divisors (see below), whose sum is σ = 27738885752. Its totient is φ = 27589248000.

The previous prime is 27664022543. The next prime is 27664022597. The reversal of 27664022557 is 75522046672.

It can be written as a sum of positive squares in 4 ways, for example, as 1208674756 + 26455347801 = 34766^2 + 162651^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27664022557 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 (27664022597) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 628453 + ... + 671029.

It is an arithmetic number, because the mean of its divisors is an integer number (3467360719).

Almost surely, 2^27664022557 is an apocalyptic number.

It is an amenable number.

27664022557 is a deficient number, since it is larger than the sum of its proper divisors (74863195).

27664022557 is a wasteful number, since it uses less digits than its factorization.

27664022557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44319.

The product of its (nonzero) digits is 1411200, while the sum is 46.

The spelling of 27664022557 in words is "twenty-seven billion, six hundred sixty-four million, twenty-two thousand, five hundred fifty-seven".