64666047 has 16 divisors (see below), whose sum is σ = 89631360. Its totient is φ = 41434272.

The previous prime is 64666033. The next prime is 64666081. The reversal of 64666047 is 74066646.

It is not a de Polignac number, because 64666047 - 2¹⁶ = 64600511 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 64665996 and 64666014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64666097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5704 + ... + 12722.

It is an arithmetic number, because the mean of its divisors is an integer number (5601960).

Almost surely, 2^64666047 is an apocalyptic number.

64666047 is a deficient number, since it is larger than the sum of its proper divisors (24965313).

64666047 is a wasteful number, since it uses less digits than its factorization.

64666047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7142.

The product of its (nonzero) digits is 145152, while the sum is 39.

The square root of 64666047 is about 8041.5201921030. The cubic root of 64666047 is about 401.3828119855.

The spelling of 64666047 in words is "sixty-four million, six hundred sixty-six thousand, forty-seven".