521045066 has 4 divisors (see below), whose sum is σ = 781567602. Its totient is φ = 260522532.

The previous prime is 521045051. The next prime is 521045069. The reversal of 521045066 is 660540125.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 373301041 + 147744025 = 19321^2 + 12155^2 .

It is not an unprimeable number, because it can be changed into a prime (521045069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130261265 + ... + 130261268.

Almost surely, 2^521045066 is an apocalyptic number.

521045066 is a deficient number, since it is larger than the sum of its proper divisors (260522536).

521045066 is a wasteful number, since it uses less digits than its factorization.

521045066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260522535.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 521045066 is about 22826.4115883334. The cubic root of 521045066 is about 804.6834994097.

The spelling of 521045066 in words is "five hundred twenty-one million, forty-five thousand, sixty-six".