521425066 has 4 divisors (see below), whose sum is σ = 782137602. Its totient is φ = 260712532.

The previous prime is 521425039. The next prime is 521425081. The reversal of 521425066 is 660524125.

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., 513702225 + 7722841 = 22665^2 + 2779^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

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, 130356265 + ... + 130356268.

Almost surely, 2^521425066 is an apocalyptic number.

521425066 is a deficient number, since it is larger than the sum of its proper divisors (260712536).

521425066 is a wasteful number, since it uses less digits than its factorization.

521425066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260712535.

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 521425066 is about 22834.7337624068. The cubic root of 521425066 is about 804.8790713761.

The spelling of 521425066 in words is "five hundred twenty-one million, four hundred twenty-five thousand, sixty-six".