66561014 has 8 divisors (see below), whose sum is σ = 107521680. Its totient is φ = 30720456.

The previous prime is 66561013. The next prime is 66561029. The reversal of 66561014 is 41016566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66561013) 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 3 ways as a sum of consecutive naturals, for example, 1279994 + ... + 1280045.

It is an arithmetic number, because the mean of its divisors is an integer number (13440210).

Almost surely, 2^66561014 is an apocalyptic number.

66561014 is a deficient number, since it is larger than the sum of its proper divisors (40960666).

66561014 is a wasteful number, since it uses less digits than its factorization.

66561014 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2560054.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 66561014 is about 8158.4933658121. The cubic root of 66561014 is about 405.2658194977.

The spelling of 66561014 in words is "sixty-six million, five hundred sixty-one thousand, fourteen".