1066599997 has 2 divisors, whose sum is σ = 1066599998. Its totient is φ = 1066599996.

The previous prime is 1066599991. The next prime is 1066600039. The reversal of 1066599997 is 7999956601.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 643433956 + 423166041 = 25366^2 + 20571^2 .

It is a cyclic number.

It is not a de Polignac number, because 1066599997 - 2⁷ = 1066599869 is a prime.

It is a super-2 number, since 2×1066599997² = 2275271107200800018, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1066599991) 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, 533299998 + 533299999.

It is an arithmetic number, because the mean of its divisors is an integer number (533299999).

Almost surely, 2^1066599997 is an apocalyptic number.

It is an amenable number.

1066599997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1066599997 is an equidigital number, since it uses as much as digits as its factorization.

1066599997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8266860, while the sum is 61.

The square root of 1066599997 is about 32658.8425545058. The cubic root of 1066599997 is about 1021.7246220835.

The spelling of 1066599997 in words is "one billion, sixty-six million, five hundred ninety-nine thousand, nine hundred ninety-seven".