66575121 has 4 divisors (see below), whose sum is σ = 88766832. Its totient is φ = 44383412.

The previous prime is 66575101. The next prime is 66575143. The reversal of 66575121 is 12157566.

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 66575121 - 2⁶ = 66575057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66575101) 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, 11095851 + ... + 11095856.

It is an arithmetic number, because the mean of its divisors is an integer number (22191708).

Almost surely, 2^66575121 is an apocalyptic number.

It is an amenable number.

66575121 is a deficient number, since it is larger than the sum of its proper divisors (22191711).

66575121 is a wasteful number, since it uses less digits than its factorization.

66575121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22191710.

The product of its digits is 12600, while the sum is 33.

The square root of 66575121 is about 8159.3578791471. The cubic root of 66575121 is about 405.2944482736.

The spelling of 66575121 in words is "sixty-six million, five hundred seventy-five thousand, one hundred twenty-one".