66031650 has 72 divisors (see below), whose sum is σ = 186766320. Its totient is φ = 16679520.

The previous prime is 66031627. The next prime is 66031687. The reversal of 66031650 is 5613066.

66031650 is a `hidden beast` number, since 6 + 6 + 0 + 3 + 1 + 650 = 666.

66031650 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

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 in 35 ways as a sum of consecutive naturals, for example, 4689 + ... + 12411.

Almost surely, 2^66031650 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66031650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93383160).

66031650 is an abundant number, since it is smaller than the sum of its proper divisors (120734670).

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

66031650 is a wasteful number, since it uses less digits than its factorization.

66031650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7760 (or 7752 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 66031650 is about 8125.9860940073. The cubic root of 66031650 is about 404.1885903484.

The spelling of 66031650 in words is "sixty-six million, thirty-one thousand, six hundred fifty".