66955418 has 8 divisors (see below), whose sum is σ = 106341012. Its totient is φ = 31508416.

The previous prime is 66955417. The next prime is 66955451. The reversal of 66955418 is 81455966.

It can be written as a sum of positive squares in 2 ways, for example, as 65334889 + 1620529 = 8083^2 + 1273^2 .

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66955417) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 984605 + ... + 984672.

Almost surely, 2^66955418 is an apocalyptic number.

66955418 is a deficient number, since it is larger than the sum of its proper divisors (39385594).

66955418 is a wasteful number, since it uses less digits than its factorization.

66955418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1969296.

The product of its digits is 259200, while the sum is 44.

The square root of 66955418 is about 8182.6290396180. The cubic root of 66955418 is about 406.0647045151.

The spelling of 66955418 in words is "sixty-six million, nine hundred fifty-five thousand, four hundred eighteen".