66631516 has 12 divisors (see below), whose sum is σ = 133263088. Its totient is φ = 28556352.

The previous prime is 66631489. The next prime is 66631549. The reversal of 66631516 is 61513666.

66631516 is an admirable number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1189821 + ... + 1189876.

Almost surely, 2^66631516 is an apocalyptic number.

It is an amenable number.

66631516 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66631516 is a wasteful number, since it uses less digits than its factorization.

66631516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2379708 (or 2379706 counting only the distinct ones).

The product of its digits is 19440, while the sum is 34.

The square root of 66631516 is about 8162.8129955304. The cubic root of 66631516 is about 405.4088560246.

The spelling of 66631516 in words is "sixty-six million, six hundred thirty-one thousand, five hundred sixteen".