520676661 has 16 divisors (see below), whose sum is σ = 709156800. Its totient is φ = 339730560.

The previous prime is 520676647. The next prime is 520676687. The reversal of 520676661 is 166676025.

It is not a de Polignac number, because 520676661 - 2¹⁴ = 520660277 is a prime.

It is a super-2 number, since 2×520676661² = 542208370620217842, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520676161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19615 + ... + 37763.

It is an arithmetic number, because the mean of its divisors is an integer number (44322300).

Almost surely, 2^520676661 is an apocalyptic number.

It is an amenable number.

520676661 is a deficient number, since it is larger than the sum of its proper divisors (188480139).

520676661 is a wasteful number, since it uses less digits than its factorization.

520676661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18356.

The product of its (nonzero) digits is 90720, while the sum is 39.

The square root of 520676661 is about 22818.3404523642. The cubic root of 520676661 is about 804.4938041609.

The spelling of 520676661 in words is "five hundred twenty million, six hundred seventy-six thousand, six hundred sixty-one".