66710047 has 8 divisors (see below), whose sum is σ = 69391872. Its totient is φ = 64061400.

The previous prime is 66710029. The next prime is 66710053. The reversal of 66710047 is 74001766.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66710047 - 2¹¹ = 66707999 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66710087) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4153 + ... + 12274.

It is an arithmetic number, because the mean of its divisors is an integer number (8673984).

Almost surely, 2^66710047 is an apocalyptic number.

66710047 is a deficient number, since it is larger than the sum of its proper divisors (2681825).

66710047 is a wasteful number, since it uses less digits than its factorization.

66710047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16589.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 66710047 is about 8167.6218693081. The cubic root of 66710047 is about 405.5680632854.

The spelling of 66710047 in words is "sixty-six million, seven hundred ten thousand, forty-seven".