16664506427 has 2 divisors, whose sum is σ = 16664506428. Its totient is φ = 16664506426.

The previous prime is 16664506409. The next prime is 16664506477. The reversal of 16664506427 is 72460546661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16664506427 - 2¹⁴ = 16664490043 is a prime.

It is not a weakly prime, because it can be changed into another prime (16664506477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8332253213 + 8332253214.

It is an arithmetic number, because the mean of its divisors is an integer number (8332253214).

Almost surely, 2^16664506427 is an apocalyptic number.

16664506427 is a deficient number, since it is larger than the sum of its proper divisors (1).

16664506427 is an equidigital number, since it uses as much as digits as its factorization.

16664506427 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1451520, while the sum is 47.

The spelling of 16664506427 in words is "sixteen billion, six hundred sixty-four million, five hundred six thousand, four hundred twenty-seven".