66504345918 has 32 divisors (see below), whose sum is σ = 133611409440. Its totient is φ = 22067773440.

The previous prime is 66504345913. The next prime is 66504345983. The reversal of 66504345918 is 81954340566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66504345913) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2560678 + ... + 2586518.

It is an arithmetic number, because the mean of its divisors is an integer number (4175356545).

Almost surely, 2^66504345918 is an apocalyptic number.

66504345918 is an abundant number, since it is smaller than the sum of its proper divisors (67107063522).

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

66504345918 is a wasteful number, since it uses less digits than its factorization.

66504345918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27772.

The product of its (nonzero) digits is 3110400, while the sum is 51.

The spelling of 66504345918 in words is "sixty-six billion, five hundred four million, three hundred forty-five thousand, nine hundred eighteen".