66361783 has 4 divisors (see below), whose sum is σ = 67296528. Its totient is φ = 65427040.

The previous prime is 66361781. The next prime is 66361787. The reversal of 66361783 is 38716366.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66361783 - 2¹ = 66361781 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66361781) 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 3 ways as a sum of consecutive naturals, for example, 467266 + ... + 467407.

It is an arithmetic number, because the mean of its divisors is an integer number (16824132).

Almost surely, 2^66361783 is an apocalyptic number.

66361783 is a deficient number, since it is larger than the sum of its proper divisors (934745).

66361783 is an equidigital number, since it uses as much as digits as its factorization.

66361783 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 934744.

The product of its digits is 108864, while the sum is 40.

The square root of 66361783 is about 8146.2741790342. The cubic root of 66361783 is about 404.8610670127.

The spelling of 66361783 in words is "sixty-six million, three hundred sixty-one thousand, seven hundred eighty-three".