66623047 has 2 divisors, whose sum is σ = 66623048. Its totient is φ = 66623046.

The previous prime is 66623033. The next prime is 66623083. The reversal of 66623047 is 74032666.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66623047 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66623027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33311523 + 33311524.

It is an arithmetic number, because the mean of its divisors is an integer number (33311524).

Almost surely, 2^66623047 is an apocalyptic number.

66623047 is a deficient number, since it is larger than the sum of its proper divisors (1).

66623047 is an equidigital number, since it uses as much as digits as its factorization.

66623047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 34.

The square root of 66623047 is about 8162.2942240525. The cubic root of 66623047 is about 405.3916792026.

The spelling of 66623047 in words is "sixty-six million, six hundred twenty-three thousand, forty-seven".