66504918 has 64 divisors (see below), whose sum is σ = 147121920. Its totient is φ = 19955712.

The previous prime is 66504913. The next prime is 66504943. The reversal of 66504918 is 81940566.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66504913) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 258646 + ... + 258902.

It is an arithmetic number, because the mean of its divisors is an integer number (2298780).

Almost surely, 2^66504918 is an apocalyptic number.

66504918 is an abundant number, since it is smaller than the sum of its proper divisors (80617002).

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

66504918 is a wasteful number, since it uses less digits than its factorization.

66504918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381.

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 66504918 is about 8155.0547515023. The cubic root of 66504918 is about 405.1519381151.

The spelling of 66504918 in words is "sixty-six million, five hundred four thousand, nine hundred eighteen".