66963783 has 16 divisors (see below), whose sum is σ = 91719936. Its totient is φ = 43431360.

The previous prime is 66963781. The next prime is 66963791. The reversal of 66963783 is 38736966.

It is a happy number.

It is not a de Polignac number, because 66963783 - 2¹ = 66963781 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66963781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68766 + ... + 69732.

It is an arithmetic number, because the mean of its divisors is an integer number (5732496).

Almost surely, 2^66963783 is an apocalyptic number.

66963783 is a deficient number, since it is larger than the sum of its proper divisors (24756153).

66963783 is a wasteful number, since it uses less digits than its factorization.

66963783 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1574.

The product of its digits is 979776, while the sum is 48.

The square root of 66963783 is about 8183.1401674418. The cubic root of 66963783 is about 406.0816142236.

The spelling of 66963783 in words is "sixty-six million, nine hundred sixty-three thousand, seven hundred eighty-three".