66654757 has 4 divisors (see below), whose sum is σ = 71782060. Its totient is φ = 61527456.

The previous prime is 66654737. The next prime is 66654779. The reversal of 66654757 is 75745666.

66654757 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23804641 + 42850116 = 4879^2 + 6546^2 .

It is a cyclic number.

It is not a de Polignac number, because 66654757 - 2⁷ = 66654629 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 (66654737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2563632 + ... + 2563657.

It is an arithmetic number, because the mean of its divisors is an integer number (17945515).

Almost surely, 2^66654757 is an apocalyptic number.

It is an amenable number.

66654757 is a deficient number, since it is larger than the sum of its proper divisors (5127303).

66654757 is a wasteful number, since it uses less digits than its factorization.

66654757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5127302.

The product of its digits is 1058400, while the sum is 46.

The square root of 66654757 is about 8164.2364615437. The cubic root of 66654757 is about 405.4559859341.

Subtracting 66654757 from its reverse (75745666), we obtain a palindrome (9090909).

The spelling of 66654757 in words is "sixty-six million, six hundred fifty-four thousand, seven hundred fifty-seven".