66856846 has 8 divisors (see below), whose sum is σ = 114611760. Its totient is φ = 28652928.

The previous prime is 66856843. The next prime is 66856847. The reversal of 66856846 is 64865866.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 66856846.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66856843) 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, 2387731 + ... + 2387758.

It is an arithmetic number, because the mean of its divisors is an integer number (14326470).

Almost surely, 2^66856846 is an apocalyptic number.

66856846 is a deficient number, since it is larger than the sum of its proper divisors (47754914).

66856846 is a wasteful number, since it uses less digits than its factorization.

66856846 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4775498.

The product of its digits is 1658880, while the sum is 49.

The square root of 66856846 is about 8176.6035736117. The cubic root of 66856846 is about 405.8653366881.

It can be divided in two parts, 6685 and 6846, that added together give a palindrome (13531).

The spelling of 66856846 in words is "sixty-six million, eight hundred fifty-six thousand, eight hundred forty-six".