66563807 has 2 divisors, whose sum is σ = 66563808. Its totient is φ = 66563806.

The previous prime is 66563773. The next prime is 66563867. The reversal of 66563807 is 70836566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66563807 - 2¹² = 66559711 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66563867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33281903 + 33281904.

It is an arithmetic number, because the mean of its divisors is an integer number (33281904).

Almost surely, 2^66563807 is an apocalyptic number.

66563807 is a deficient number, since it is larger than the sum of its proper divisors (1).

66563807 is an equidigital number, since it uses as much as digits as its factorization.

66563807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181440, while the sum is 41.

The square root of 66563807 is about 8158.6645353268. The cubic root of 66563807 is about 405.2714879390.

The spelling of 66563807 in words is "sixty-six million, five hundred sixty-three thousand, eight hundred seven".