66755757 has 4 divisors (see below), whose sum is σ = 89007680. Its totient is φ = 44503836.

The previous prime is 66755707. The next prime is 66755783. The reversal of 66755757 is 75755766.

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 not a de Polignac number, because 66755757 - 2⁸ = 66755501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66755707) 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, 11125957 + ... + 11125962.

It is an arithmetic number, because the mean of its divisors is an integer number (22251920).

Almost surely, 2^66755757 is an apocalyptic number.

It is an amenable number.

66755757 is a deficient number, since it is larger than the sum of its proper divisors (22251923).

66755757 is a wasteful number, since it uses less digits than its factorization.

66755757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22251922.

The product of its digits is 1543500, while the sum is 48.

The square root of 66755757 is about 8170.4196342660. The cubic root of 66755757 is about 405.6606744407.

Subtracting 66755757 from its reverse (75755766), we obtain a palindrome (9000009).

The spelling of 66755757 in words is "sixty-six million, seven hundred fifty-five thousand, seven hundred fifty-seven".