66388783 has 2 divisors, whose sum is σ = 66388784. Its totient is φ = 66388782.

The previous prime is 66388781. The next prime is 66388849. The reversal of 66388783 is 38788366.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66388783 - 2¹ = 66388781 is a prime.

Together with 66388781, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66388781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33194391 + 33194392.

It is an arithmetic number, because the mean of its divisors is an integer number (33194392).

Almost surely, 2^66388783 is an apocalyptic number.

66388783 is a deficient number, since it is larger than the sum of its proper divisors (1).

66388783 is an equidigital number, since it uses as much as digits as its factorization.

66388783 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1161216, while the sum is 49.

The square root of 66388783 is about 8147.9312098225. The cubic root of 66388783 is about 404.9159669172.

The spelling of 66388783 in words is "sixty-six million, three hundred eighty-eight thousand, seven hundred eighty-three".