521217166 has 16 divisors (see below), whose sum is σ = 790728480. Its totient is φ = 257648800.

The previous prime is 521217163. The next prime is 521217173. The reversal of 521217166 is 661712125.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521217163) 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 in 7 ways as a sum of consecutive naturals, for example, 177720 + ... + 180628.

It is an arithmetic number, because the mean of its divisors is an integer number (49420530).

Almost surely, 2^521217166 is an apocalyptic number.

521217166 is a deficient number, since it is larger than the sum of its proper divisors (269511314).

521217166 is a wasteful number, since it uses less digits than its factorization.

521217166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3899.

The product of its digits is 5040, while the sum is 31.

The square root of 521217166 is about 22830.1810330098. The cubic root of 521217166 is about 804.7720847003.

The spelling of 521217166 in words is "five hundred twenty-one million, two hundred seventeen thousand, one hundred sixty-six".