66936847 has 4 divisors (see below), whose sum is σ = 66954096. Its totient is φ = 66919600.

The previous prime is 66936833. The next prime is 66936899. The reversal of 66936847 is 74863966.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66936847 - 2¹⁹ = 66412559 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 66936847.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66936817) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 222 + ... + 11572.

It is an arithmetic number, because the mean of its divisors is an integer number (16738524).

Almost surely, 2^66936847 is an apocalyptic number.

66936847 is a deficient number, since it is larger than the sum of its proper divisors (17249).

66936847 is a wasteful number, since it uses less digits than its factorization.

66936847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17248.

The product of its digits is 1306368, while the sum is 49.

The square root of 66936847 is about 8181.4941789382. The cubic root of 66936847 is about 406.0271585123.

The spelling of 66936847 in words is "sixty-six million, nine hundred thirty-six thousand, eight hundred forty-seven".