66631016 has 8 divisors (see below), whose sum is σ = 124933170. Its totient is φ = 33315504.

The previous prime is 66631003. The next prime is 66631021. The reversal of 66631016 is 61013666.

It can be written as a sum of positive squares in only one way, i.e., 41088100 + 25542916 = 6410^2 + 5054^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 66631016.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4164431 + ... + 4164446.

Almost surely, 2^66631016 is an apocalyptic number.

It is an amenable number.

66631016 is a deficient number, since it is larger than the sum of its proper divisors (58302154).

66631016 is a wasteful number, since it uses less digits than its factorization.

66631016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8328883 (or 8328879 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 66631016 is about 8162.7823687760. The cubic root of 66631016 is about 405.4078419653.

The spelling of 66631016 in words is "sixty-six million, six hundred thirty-one thousand, sixteen".