66764273 has 4 divisors (see below), whose sum is σ = 66946560. Its totient is φ = 66581988.

The previous prime is 66764249. The next prime is 66764279. The reversal of 66764273 is 37246766.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66764273 - 2⁶ = 66764209 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 66764273.

It is not an unprimeable number, because it can be changed into a prime (66764279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90593 + ... + 91326.

It is an arithmetic number, because the mean of its divisors is an integer number (16736640).

Almost surely, 2^66764273 is an apocalyptic number.

It is an amenable number.

66764273 is a deficient number, since it is larger than the sum of its proper divisors (182287).

66764273 is a wasteful number, since it uses less digits than its factorization.

66764273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182286.

The product of its digits is 254016, while the sum is 41.

The square root of 66764273 is about 8170.9407659094. The cubic root of 66764273 is about 405.6779236866.

The spelling of 66764273 in words is "sixty-six million, seven hundred sixty-four thousand, two hundred seventy-three".