66641630 has 32 divisors (see below), whose sum is σ = 135088128. Its totient is φ = 23450400.

The previous prime is 66641609. The next prime is 66641639. The reversal of 66641630 is 3614666.

It is a super-2 number, since 2×66641630² = 8882213698113800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66641639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6362 + ... + 13181.

It is an arithmetic number, because the mean of its divisors is an integer number (4221504).

Almost surely, 2^66641630 is an apocalyptic number.

66641630 is an abundant number, since it is smaller than the sum of its proper divisors (68446498).

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

66641630 is a wasteful number, since it uses less digits than its factorization.

66641630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19592.

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 66641630 is about 8163.4324888493. The cubic root of 66641630 is about 405.4293673280.

The spelling of 66641630 in words is "sixty-six million, six hundred forty-one thousand, six hundred thirty".