517520661 has 16 divisors (see below), whose sum is σ = 789026304. Its totient is φ = 295567344.

The previous prime is 517520593. The next prime is 517520669. The reversal of 517520661 is 166025715.

It is not a de Polignac number, because 517520661 - 2⁷ = 517520533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (517520669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41610 + ... + 52596.

It is an arithmetic number, because the mean of its divisors is an integer number (49314144).

Almost surely, 2^517520661 is an apocalyptic number.

It is an amenable number.

517520661 is a deficient number, since it is larger than the sum of its proper divisors (271505643).

517520661 is a wasteful number, since it uses less digits than its factorization.

517520661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13240.

The product of its (nonzero) digits is 12600, while the sum is 33.

The square root of 517520661 is about 22749.0804429542. The cubic root of 517520661 is about 802.8650712303.

The spelling of 517520661 in words is "five hundred seventeen million, five hundred twenty thousand, six hundred sixty-one".