1066019861 has 2 divisors, whose sum is σ = 1066019862. Its totient is φ = 1066019860.

The previous prime is 1066019827. The next prime is 1066019863. The reversal of 1066019861 is 1689106601.

1066019861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 703840900 + 362178961 = 26530^2 + 19031^2 .

It is a cyclic number.

It is not a de Polignac number, because 1066019861 - 2¹⁸ = 1065757717 is a prime.

It is a super-2 number, since 2×1066019861² = 2272796688092918642, which contains 22 as substring.

Together with 1066019863, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1066019863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 533009930 + 533009931.

It is an arithmetic number, because the mean of its divisors is an integer number (533009931).

Almost surely, 2^1066019861 is an apocalyptic number.

It is an amenable number.

1066019861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1066019861 is an equidigital number, since it uses as much as digits as its factorization.

1066019861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 1066019861 is about 32649.9595864987. The cubic root of 1066019861 is about 1021.5393458990.

The spelling of 1066019861 in words is "one billion, sixty-six million, nineteen thousand, eight hundred sixty-one".