66548057 has 4 divisors (see below), whose sum is σ = 67026960. Its totient is φ = 66069156.

The previous prime is 66548021. The next prime is 66548077. The reversal of 66548057 is 75084566.

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, and also an emirpimes, since its reverse is a distinct semiprime: 75084566 = 2 ⋅37542283.

It is a cyclic number.

It is not a de Polignac number, because 66548057 - 2⁸ = 66547801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66548077) 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, 239243 + ... + 239520.

It is an arithmetic number, because the mean of its divisors is an integer number (16756740).

Almost surely, 2^66548057 is an apocalyptic number.

It is an amenable number.

66548057 is a deficient number, since it is larger than the sum of its proper divisors (478903).

66548057 is a wasteful number, since it uses less digits than its factorization.

66548057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478902.

The product of its (nonzero) digits is 201600, while the sum is 41.

The square root of 66548057 is about 8157.6992467239. The cubic root of 66548057 is about 405.2395209701.

The spelling of 66548057 in words is "sixty-six million, five hundred forty-eight thousand, fifty-seven".