66620577 has 4 divisors (see below), whose sum is σ = 88827440. Its totient is φ = 44413716.

The previous prime is 66620563. The next prime is 66620597. The reversal of 66620577 is 77502666.

66620577 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 66620577 - 2⁶ = 66620513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66620527) 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, 11103427 + ... + 11103432.

It is an arithmetic number, because the mean of its divisors is an integer number (22206860).

Almost surely, 2^66620577 is an apocalyptic number.

It is an amenable number.

66620577 is a deficient number, since it is larger than the sum of its proper divisors (22206863).

66620577 is a wasteful number, since it uses less digits than its factorization.

66620577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22206862.

The product of its (nonzero) digits is 105840, while the sum is 39.

The square root of 66620577 is about 8162.1429171511. The cubic root of 66620577 is about 405.3866692755.

The spelling of 66620577 in words is "sixty-six million, six hundred twenty thousand, five hundred seventy-seven".