27620378521 has 2 divisors, whose sum is σ = 27620378522. Its totient is φ = 27620378520.

The previous prime is 27620378509. The next prime is 27620378537. The reversal of 27620378521 is 12587302672.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26740425625 + 879952896 = 163525^2 + 29664^2 .

It is a cyclic number.

It is not a de Polignac number, because 27620378521 - 2¹⁷ = 27620247449 is a prime.

It is not a weakly prime, because it can be changed into another prime (27620378561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13810189260 + 13810189261.

It is an arithmetic number, because the mean of its divisors is an integer number (13810189261).

Almost surely, 2^27620378521 is an apocalyptic number.

It is an amenable number.

27620378521 is a deficient number, since it is larger than the sum of its proper divisors (1).

27620378521 is an equidigital number, since it uses as much as digits as its factorization.

27620378521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 282240, while the sum is 43.

The spelling of 27620378521 in words is "twenty-seven billion, six hundred twenty million, three hundred seventy-eight thousand, five hundred twenty-one".