66617047 has 8 divisors (see below), whose sum is σ = 78589952. Its totient is φ = 55258200.

The previous prime is 66617029. The next prime is 66617051. The reversal of 66617047 is 74071666.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66617047 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66616997 and 66617015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66617017) 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 7 ways as a sum of consecutive naturals, for example, 153279 + ... + 153712.

It is an arithmetic number, because the mean of its divisors is an integer number (9823744).

Almost surely, 2^66617047 is an apocalyptic number.

66617047 is a deficient number, since it is larger than the sum of its proper divisors (11972905).

66617047 is a wasteful number, since it uses less digits than its factorization.

66617047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307029.

The product of its (nonzero) digits is 42336, while the sum is 37.

The square root of 66617047 is about 8161.9266720548. The cubic root of 66617047 is about 405.3795091243.

The spelling of 66617047 in words is "sixty-six million, six hundred seventeen thousand, forty-seven".