1066840637 has 2 divisors, whose sum is σ = 1066840638. Its totient is φ = 1066840636.

The previous prime is 1066840631. The next prime is 1066840693. The reversal of 1066840637 is 7360486601.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1019588761 + 47251876 = 31931^2 + 6874^2 .

It is a cyclic number.

It is not a de Polignac number, because 1066840637 - 2²⁶ = 999731773 is a prime.

It is a super-2 number, since 2×1066840637² = 2276297889509131538, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1066840594 and 1066840603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1066840631) 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, 533420318 + 533420319.

It is an arithmetic number, because the mean of its divisors is an integer number (533420319).

Almost surely, 2^1066840637 is an apocalyptic number.

It is an amenable number.

1066840637 is a deficient number, since it is larger than the sum of its proper divisors (1).

1066840637 is an equidigital number, since it uses as much as digits as its factorization.

1066840637 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 41.

The square root of 1066840637 is about 32662.5264944401. The cubic root of 1066840637 is about 1021.8014547999.

The spelling of 1066840637 in words is "one billion, sixty-six million, eight hundred forty thousand, six hundred thirty-seven".