66601650 has 48 divisors (see below), whose sum is σ = 173872800. Its totient is φ = 16824960.

The previous prime is 66601649. The next prime is 66601657. The reversal of 66601650 is 5610666.

66601650 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66601657) 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 in 23 ways as a sum of consecutive naturals, for example, 8835 + ... + 14534.

It is an arithmetic number, because the mean of its divisors is an integer number (3622350).

Almost surely, 2^66601650 is an apocalyptic number.

66601650 is an abundant number, since it is smaller than the sum of its proper divisors (107271150).

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

66601650 is a wasteful number, since it uses less digits than its factorization.

66601650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23403 (or 23398 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 66601650 is about 8160.9833966257. The cubic root of 66601650 is about 405.3482753309.

The spelling of 66601650 in words is "sixty-six million, six hundred one thousand, six hundred fifty".