66685630 has 32 divisors (see below), whose sum is σ = 137842560. Its totient is φ = 22972320.

The previous prime is 66685609. The next prime is 66685631. The reversal of 66685630 is 3658666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66685631) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 13864 + ... + 18043.

It is an arithmetic number, because the mean of its divisors is an integer number (4307580).

Almost surely, 2^66685630 is an apocalyptic number.

66685630 is an abundant number, since it is smaller than the sum of its proper divisors (71156930).

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

66685630 is a wasteful number, since it uses less digits than its factorization.

66685630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31944.

The product of its (nonzero) digits is 155520, while the sum is 40.

The square root of 66685630 is about 8166.1269889710. The cubic root of 66685630 is about 405.5185756681.

The spelling of 66685630 in words is "sixty-six million, six hundred eighty-five thousand, six hundred thirty".