521375066 has 16 divisors (see below), whose sum is σ = 803985000. Its totient is φ = 253393920.

The previous prime is 521375053. The next prime is 521375069. The reversal of 521375066 is 660573125.

It can be written as a sum of positive squares in 4 ways, for example, as 512796025 + 8579041 = 22645^2 + 2929^2 .

It is not an unprimeable number, because it can be changed into a prime (521375069) 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, 89606 + ... + 95246.

Almost surely, 2^521375066 is an apocalyptic number.

521375066 is a deficient number, since it is larger than the sum of its proper divisors (282609934).

521375066 is a wasteful number, since it uses less digits than its factorization.

521375066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6929.

The product of its (nonzero) digits is 37800, while the sum is 35.

The square root of 521375066 is about 22833.6389127971. The cubic root of 521375066 is about 804.8533436524.

The spelling of 521375066 in words is "five hundred twenty-one million, three hundred seventy-five thousand, sixty-six".