1000666637 has 2 divisors, whose sum is σ = 1000666638. Its totient is φ = 1000666636.

The previous prime is 1000666627. The next prime is 1000666649. The reversal of 1000666637 is 7366660001.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 847624996 + 153041641 = 29114^2 + 12371^2 .

It is a cyclic number.

It is not a de Polignac number, because 1000666637 - 2⁶ = 1000666573 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1000666597 and 1000666606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1000666627) 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, 500333318 + 500333319.

It is an arithmetic number, because the mean of its divisors is an integer number (500333319).

Almost surely, 2^1000666637 is an apocalyptic number.

It is an amenable number.

1000666637 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000666637 is an equidigital number, since it uses as much as digits as its factorization.

1000666637 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 35.

The square root of 1000666637 is about 31633.3153020672. The cubic root of 1000666637 is about 1000.2221629733. Note that the first 3 decimals are identical.

The spelling of 1000666637 in words is "one billion, six hundred sixty-six thousand, six hundred thirty-seven".