66997033 has 2 divisors, whose sum is σ = 66997034. Its totient is φ = 66997032.

The previous prime is 66997031. The next prime is 66997061. The reversal of 66997033 is 33079966.

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., 52881984 + 14115049 = 7272^2 + 3757^2 .

It is a cyclic number.

It is not a de Polignac number, because 66997033 - 2¹ = 66997031 is a prime.

Together with 66997031, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (66997031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33498516 + 33498517.

It is an arithmetic number, because the mean of its divisors is an integer number (33498517).

Almost surely, 2^66997033 is an apocalyptic number.

It is an amenable number.

66997033 is a deficient number, since it is larger than the sum of its proper divisors (1).

66997033 is an equidigital number, since it uses as much as digits as its factorization.

66997033 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 183708, while the sum is 43.

The square root of 66997033 is about 8185.1715314952. The cubic root of 66997033 is about 406.1488146261.

The spelling of 66997033 in words is "sixty-six million, nine hundred ninety-seven thousand, thirty-three".