65851666 has 4 divisors (see below), whose sum is σ = 98777502. Its totient is φ = 32925832.

The previous prime is 65851661. The next prime is 65851673. The reversal of 65851666 is 66615856.

65851666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 39627025 + 26224641 = 6295^2 + 5121^2 .

It is not an unprimeable number, because it can be changed into a prime (65851661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16462915 + ... + 16462918.

Almost surely, 2^65851666 is an apocalyptic number.

65851666 is a deficient number, since it is larger than the sum of its proper divisors (32925836).

65851666 is a wasteful number, since it uses less digits than its factorization.

65851666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32925835.

The product of its digits is 259200, while the sum is 43.

The square root of 65851666 is about 8114.9039427463. The cubic root of 65851666 is about 403.8210207763.

The spelling of 65851666 in words is "sixty-five million, eight hundred fifty-one thousand, six hundred sixty-six".