66000997 has 2 divisors, whose sum is σ = 66000998. Its totient is φ = 66000996.

The previous prime is 66000989. The next prime is 66001027. The reversal of 66000997 is 79900066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39929761 + 26071236 = 6319^2 + 5106^2 .

It is a cyclic number.

It is not a de Polignac number, because 66000997 - 2³ = 66000989 is a prime.

It is a super-2 number, since 2×66000997² = 8712263209988018, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66000967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33000498 + 33000499.

It is an arithmetic number, because the mean of its divisors is an integer number (33000499).

Almost surely, 2^66000997 is an apocalyptic number.

It is an amenable number.

66000997 is a deficient number, since it is larger than the sum of its proper divisors (1).

66000997 is an equidigital number, since it uses as much as digits as its factorization.

66000997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20412, while the sum is 37.

The square root of 66000997 is about 8124.0997655125. The cubic root of 66000997 is about 404.1260369592.

The spelling of 66000997 in words is "sixty-six million, nine hundred ninety-seven", and thus it is an aban number.