66771047 has 16 divisors (see below), whose sum is σ = 79875072. Its totient is φ = 54574080.

The previous prime is 66771031. The next prime is 66771059. The reversal of 66771047 is 74017766.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 66771047 - 2⁴ = 66771031 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66771047.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66774047) 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 15 ways as a sum of consecutive naturals, for example, 102878 + ... + 103524.

It is an arithmetic number, because the mean of its divisors is an integer number (4992192).

Almost surely, 2^66771047 is an apocalyptic number.

66771047 is a deficient number, since it is larger than the sum of its proper divisors (13104025).

66771047 is a wasteful number, since it uses less digits than its factorization.

66771047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1318.

The product of its (nonzero) digits is 49392, while the sum is 38.

The square root of 66771047 is about 8171.3552731478. The cubic root of 66771047 is about 405.6916434462.

The spelling of 66771047 in words is "sixty-six million, seven hundred seventy-one thousand, forty-seven".