66410320804 has 27 divisors (see below), whose sum is σ = 116895745057. Its totient is φ = 33012657008.

The previous prime is 66410320793. The next prime is 66410320877. The reversal of 66410320804 is 40802301466.

The square root of 66410320804 is 257702.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 4369474404 + 62040846400 = 66102^2 + 249080^2 .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66410320804.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 138643437 + ... + 138643915.

Almost surely, 2^66410320804 is an apocalyptic number.

66410320804 is the 257702-nd square number.

It is an amenable number.

66410320804 is a deficient number, since it is larger than the sum of its proper divisors (50485424253).

66410320804 is an frugal number, since it uses more digits than its factorization.

66410320804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1500 (or 750 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 34.

The spelling of 66410320804 in words is "sixty-six billion, four hundred ten million, three hundred twenty thousand, eight hundred four".