66512260 has 24 divisors (see below), whose sum is σ = 140086296. Its totient is φ = 26526720.

The previous prime is 66512249. The next prime is 66512261. The reversal of 66512260 is 6221566.

It can be written as a sum of positive squares in 4 ways, for example, as 2256004 + 64256256 = 1502^2 + 8016^2 .

It is not an unprimeable number, because it can be changed into a prime (66512261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2350 + ... + 11770.

It is an arithmetic number, because the mean of its divisors is an integer number (5836929).

Almost surely, 2^66512260 is an apocalyptic number.

It is an amenable number.

66512260 is an abundant number, since it is smaller than the sum of its proper divisors (73574036).

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

66512260 is a wasteful number, since it uses less digits than its factorization.

66512260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9783 (or 9781 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 66512260 is about 8155.5048893370. The cubic root of 66512260 is about 405.1668468675.

It can be divided in two parts, 6651 and 2260, that added together give a triangular number (8911 = T₁₃₃).

The spelling of 66512260 in words is "sixty-six million, five hundred twelve thousand, two hundred sixty".