1066451591 has 2 divisors, whose sum is σ = 1066451592. Its totient is φ = 1066451590.

The previous prime is 1066451579. The next prime is 1066451611. The reversal of 1066451591 is 1951546601.

1066451591 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1066451591 - 2²⁶ = 999342727 is a prime.

It is a super-2 number, since 2×1066451591² = 2274637991892862562, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1066451501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 533225795 + 533225796.

It is an arithmetic number, because the mean of its divisors is an integer number (533225796).

Almost surely, 2^1066451591 is an apocalyptic number.

1066451591 is a deficient number, since it is larger than the sum of its proper divisors (1).

1066451591 is an equidigital number, since it uses as much as digits as its factorization.

1066451591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32400, while the sum is 38.

The square root of 1066451591 is about 32656.5704108683. The cubic root of 1066451591 is about 1021.6772325286.

The spelling of 1066451591 in words is "one billion, sixty-six million, four hundred fifty-one thousand, five hundred ninety-one".