27720586651 has 2 divisors, whose sum is σ = 27720586652. Its totient is φ = 27720586650.

The previous prime is 27720586637. The next prime is 27720586669. The reversal of 27720586651 is 15668502772.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27720586651 - 2¹⁷ = 27720455579 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 27720586595 and 27720586604.

It is not a weakly prime, because it can be changed into another prime (27750586651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13860293325 + 13860293326.

It is an arithmetic number, because the mean of its divisors is an integer number (13860293326).

Almost surely, 2^27720586651 is an apocalyptic number.

27720586651 is a deficient number, since it is larger than the sum of its proper divisors (1).

27720586651 is an equidigital number, since it uses as much as digits as its factorization.

27720586651 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1411200, while the sum is 49.

The spelling of 27720586651 in words is "twenty-seven billion, seven hundred twenty million, five hundred eighty-six thousand, six hundred fifty-one".