666993037 has 2 divisors, whose sum is σ = 666993038. Its totient is φ = 666993036.

The previous prime is 666993007. The next prime is 666993071. The reversal of 666993037 is 730399666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 570540996 + 96452041 = 23886^2 + 9821^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666993037 is a prime.

It is a super-2 number, since 2×666993037² = 889759422812966738, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666993007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333496518 + 333496519.

It is an arithmetic number, because the mean of its divisors is an integer number (333496519).

Almost surely, 2^666993037 is an apocalyptic number.

It is an amenable number.

666993037 is a deficient number, since it is larger than the sum of its proper divisors (1).

666993037 is an equidigital number, since it uses as much as digits as its factorization.

666993037 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1102248, while the sum is 49.

The square root of 666993037 is about 25826.2083357197. The cubic root of 666993037 is about 873.7229968534.

The spelling of 666993037 in words is "six hundred sixty-six million, nine hundred ninety-three thousand, thirty-seven".