66223757 has 4 divisors (see below), whose sum is σ = 66243840. Its totient is φ = 66203676.

The previous prime is 66223723. The next prime is 66223771. The reversal of 66223757 is 75732266.

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 66223757 - 2¹⁴ = 66207373 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 66223757.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66223057) 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, 3803 + ... + 12120.

It is an arithmetic number, because the mean of its divisors is an integer number (16560960).

Almost surely, 2^66223757 is an apocalyptic number.

It is an amenable number.

66223757 is a deficient number, since it is larger than the sum of its proper divisors (20083).

66223757 is a wasteful number, since it uses less digits than its factorization.

66223757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20082.

The product of its digits is 105840, while the sum is 38.

The square root of 66223757 is about 8137.7980436971. The cubic root of 66223757 is about 404.5801817476.

The spelling of 66223757 in words is "sixty-six million, two hundred twenty-three thousand, seven hundred fifty-seven".