66774851 has 8 divisors (see below), whose sum is σ = 78448944. Its totient is φ = 56034720.

The previous prime is 66774823. The next prime is 66774853. The reversal of 66774851 is 15847766.

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 66774851 - 2⁶ = 66774787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66774853) 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 7 ways as a sum of consecutive naturals, for example, 233336 + ... + 233621.

It is an arithmetic number, because the mean of its divisors is an integer number (9806118).

Almost surely, 2^66774851 is an apocalyptic number.

66774851 is a deficient number, since it is larger than the sum of its proper divisors (11674093).

66774851 is a wasteful number, since it uses less digits than its factorization.

66774851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 466981.

The product of its digits is 282240, while the sum is 44.

The square root of 66774851 is about 8171.5880341584. The cubic root of 66774851 is about 405.6993474925.

The spelling of 66774851 in words is "sixty-six million, seven hundred seventy-four thousand, eight hundred fifty-one".