66541394 has 8 divisors (see below), whose sum is σ = 101695500. Its totient is φ = 32642896.

The previous prime is 66541381. The next prime is 66541403. The reversal of 66541394 is 49314566.

It can be written as a sum of positive squares in 2 ways, for example, as 66210769 + 330625 = 8137^2 + 575^2 .

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

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 313769 + ... + 313980.

Almost surely, 2^66541394 is an apocalyptic number.

66541394 is a deficient number, since it is larger than the sum of its proper divisors (35154106).

66541394 is a wasteful number, since it uses less digits than its factorization.

66541394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 627804.

The product of its digits is 77760, while the sum is 38.

The square root of 66541394 is about 8157.2908492955. The cubic root of 66541394 is about 405.2259959018.

The spelling of 66541394 in words is "sixty-six million, five hundred forty-one thousand, three hundred ninety-four".