27721852849 has 2 divisors, whose sum is σ = 27721852850. Its totient is φ = 27721852848.

The previous prime is 27721852817. The next prime is 27721852861. The reversal of 27721852849 is 94825812772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20965012849 + 6756840000 = 144793^2 + 82200^2 .

It is a cyclic number.

It is not a de Polignac number, because 27721852849 - 2⁵ = 27721852817 is a prime.

It is a super-2 number, since 2×27721852849² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 27721852849.

It is not a weakly prime, because it can be changed into another prime (27721852649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13860926424 + 13860926425.

It is an arithmetic number, because the mean of its divisors is an integer number (13860926425).

Almost surely, 2^27721852849 is an apocalyptic number.

It is an amenable number.

27721852849 is a deficient number, since it is larger than the sum of its proper divisors (1).

27721852849 is an equidigital number, since it uses as much as digits as its factorization.

27721852849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4515840, while the sum is 55.

The spelling of 27721852849 in words is "twenty-seven billion, seven hundred twenty-one million, eight hundred fifty-two thousand, eight hundred forty-nine".