1066644101 has 2 divisors, whose sum is σ = 1066644102. Its totient is φ = 1066644100.

The previous prime is 1066644091. The next prime is 1066644143. The reversal of 1066644101 is 1014466601.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1055925025 + 10719076 = 32495^2 + 3274^2 .

It is a cyclic number.

It is not a de Polignac number, because 1066644101 - 2¹⁸ = 1066381957 is a prime.

It is a super-2 number, since 2×1066644101² = 2275459276396196402, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1066644181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 533322050 + 533322051.

It is an arithmetic number, because the mean of its divisors is an integer number (533322051).

Almost surely, 2^1066644101 is an apocalyptic number.

It is an amenable number.

1066644101 is a deficient number, since it is larger than the sum of its proper divisors (1).

1066644101 is an equidigital number, since it uses as much as digits as its factorization.

1066644101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 1066644101 is about 32659.5177704754. The cubic root of 1066644101 is about 1021.7387046893.

The spelling of 1066644101 in words is "one billion, sixty-six million, six hundred forty-four thousand, one hundred one".