66404583 has 16 divisors (see below), whose sum is σ = 112431360. Its totient is φ = 37945368.

The previous prime is 66404581. The next prime is 66404593. The reversal of 66404583 is 38540466.

66404583 is a `hidden beast` number, since 6 + 640 + 4 + 5 + 8 + 3 = 666.

It is not a de Polignac number, because 66404583 - 2¹ = 66404581 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66404581) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 175485 + ... + 175862.

It is an arithmetic number, because the mean of its divisors is an integer number (7026960).

Almost surely, 2^66404583 is an apocalyptic number.

66404583 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

66404583 is a deficient number, since it is larger than the sum of its proper divisors (46026777).

66404583 is a wasteful number, since it uses less digits than its factorization.

66404583 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351363 (or 351357 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The square root of 66404583 is about 8148.9007234105. The cubic root of 66404583 is about 404.9480866244.

It can be divided in two parts, 664045 and 83, that added together give a triangular number (664128 = T₁₁₅₂).

The spelling of 66404583 in words is "sixty-six million, four hundred four thousand, five hundred eighty-three".