66447851 has 8 divisors (see below), whose sum is σ = 69431040. Its totient is φ = 63472552.

The previous prime is 66447833. The next prime is 66447859. The reversal of 66447851 is 15874466.

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-66447851 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66447799 and 66447808.

It is not an unprimeable number, because it can be changed into a prime (66447859) 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, 21140 + ... + 24078.

It is an arithmetic number, because the mean of its divisors is an integer number (8678880).

Almost surely, 2^66447851 is an apocalyptic number.

66447851 is a deficient number, since it is larger than the sum of its proper divisors (2983189).

66447851 is a wasteful number, since it uses less digits than its factorization.

66447851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3945.

The product of its digits is 161280, while the sum is 41.

The square root of 66447851 is about 8151.5551277042. Note that the first 3 decimals coincide. The cubic root of 66447851 is about 405.0360197604.

The spelling of 66447851 in words is "sixty-six million, four hundred forty-seven thousand, eight hundred fifty-one".