27661630819 has 2 divisors, whose sum is σ = 27661630820. Its totient is φ = 27661630818.

The previous prime is 27661630817. The next prime is 27661630837. The reversal of 27661630819 is 91803616672.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27661630819 - 2¹ = 27661630817 is a prime.

It is a super-2 number, since 2×27661630819² (a number of 22 digits) contains 22 as substring.

Together with 27661630817, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (27661630811) 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, 13830815409 + 13830815410.

It is an arithmetic number, because the mean of its divisors is an integer number (13830815410).

Almost surely, 2^27661630819 is an apocalyptic number.

27661630819 is a deficient number, since it is larger than the sum of its proper divisors (1).

27661630819 is an equidigital number, since it uses as much as digits as its factorization.

27661630819 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 653184, while the sum is 49.

The spelling of 27661630819 in words is "twenty-seven billion, six hundred sixty-one million, six hundred thirty thousand, eight hundred nineteen".