66807047 has 2 divisors, whose sum is σ = 66807048. Its totient is φ = 66807046.

The previous prime is 66807043. The next prime is 66807067. The reversal of 66807047 is 74070866.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66807047 - 2² = 66807043 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66807047.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66807043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33403523 + 33403524.

It is an arithmetic number, because the mean of its divisors is an integer number (33403524).

Almost surely, 2^66807047 is an apocalyptic number.

66807047 is a deficient number, since it is larger than the sum of its proper divisors (1).

66807047 is an equidigital number, since it uses as much as digits as its factorization.

66807047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56448, while the sum is 38.

The square root of 66807047 is about 8173.5577932746. The cubic root of 66807047 is about 405.7645406865.

The spelling of 66807047 in words is "sixty-six million, eight hundred seven thousand, forty-seven".