66761573 has 8 divisors (see below), whose sum is σ = 71771520. Its totient is φ = 61901280.

The previous prime is 66761537. The next prime is 66761587. The reversal of 66761573 is 37516766.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66761573 - 2¹⁶ = 66696037 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66761573.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66761173) 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 7 ways as a sum of consecutive naturals, for example, 36488 + ... + 38273.

It is an arithmetic number, because the mean of its divisors is an integer number (8971440).

Almost surely, 2^66761573 is an apocalyptic number.

It is an amenable number.

66761573 is a deficient number, since it is larger than the sum of its proper divisors (5009947).

66761573 is a wasteful number, since it uses less digits than its factorization.

66761573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74827.

The product of its digits is 158760, while the sum is 41.

The square root of 66761573 is about 8170.7755445857. The cubic root of 66761573 is about 405.6724549676.

The spelling of 66761573 in words is "sixty-six million, seven hundred sixty-one thousand, five hundred seventy-three".