1566166001 has 2 divisors, whose sum is σ = 1566166002. Its totient is φ = 1566166000.

The previous prime is 1566165983. The next prime is 1566166003. The reversal of 1566166001 is 1006616651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1039417600 + 526748401 = 32240^2 + 22951^2 .

It is a cyclic number.

It is not a de Polignac number, because 1566166001 - 2¹⁴ = 1566149617 is a prime.

It is a Sophie Germain prime.

Together with 1566166003, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1566166003) 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, 783083000 + 783083001.

It is an arithmetic number, because the mean of its divisors is an integer number (783083001).

Almost surely, 2^1566166001 is an apocalyptic number.

It is an amenable number.

1566166001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1566166001 is an equidigital number, since it uses as much as digits as its factorization.

1566166001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 1566166001 is about 39574.8152364607. The cubic root of 1566166001 is about 1161.3040232669.

The spelling of 1566166001 in words is "one billion, five hundred sixty-six million, one hundred sixty-six thousand, one".