1066450391 has 2 divisors, whose sum is σ = 1066450392. Its totient is φ = 1066450390.

The previous prime is 1066450367. The next prime is 1066450423. The reversal of 1066450391 is 1930546601.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1066450391 - 2⁶ = 1066450327 is a prime.

It is a super-2 number, since 2×1066450391² = 2274632872928105762, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1066453391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 533225195 + 533225196.

It is an arithmetic number, because the mean of its divisors is an integer number (533225196).

Almost surely, 2^1066450391 is an apocalyptic number.

1066450391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1066450391 is an equidigital number, since it uses as much as digits as its factorization.

1066450391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 1066450391 is about 32656.5520378377. The cubic root of 1066450391 is about 1021.6768493223.

Adding to 1066450391 its reverse (1930546601), we get a palindrome (2996996992).

The spelling of 1066450391 in words is "one billion, sixty-six million, four hundred fifty thousand, three hundred ninety-one".