1566631971427 has 2 divisors, whose sum is σ = 1566631971428. Its totient is φ = 1566631971426.

The previous prime is 1566631971409. The next prime is 1566631971481. The reversal of 1566631971427 is 7241791366651.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1566631971427 - 2⁷ = 1566631971299 is a prime.

It is not a weakly prime, because it can be changed into another prime (1566631671427) 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, 783315985713 + 783315985714.

It is an arithmetic number, because the mean of its divisors is an integer number (783315985714).

Almost surely, 2^{1566631971427} is an apocalyptic number.

1566631971427 is a deficient number, since it is larger than the sum of its proper divisors (1).

1566631971427 is an equidigital number, since it uses as much as digits as its factorization.

1566631971427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11430720, while the sum is 58.

The spelling of 1566631971427 in words is "one trillion, five hundred sixty-six billion, six hundred thirty-one million, nine hundred seventy-one thousand, four hundred twenty-seven".