520332661 has 2 divisors, whose sum is σ = 520332662. Its totient is φ = 520332660.

The previous prime is 520332647. The next prime is 520332667. The reversal of 520332661 is 166233025.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 514427761 + 5904900 = 22681^2 + 2430^2 .

It is a cyclic number.

It is not a de Polignac number, because 520332661 - 2⁹ = 520332149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (520332667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260166330 + 260166331.

It is an arithmetic number, because the mean of its divisors is an integer number (260166331).

Almost surely, 2^520332661 is an apocalyptic number.

It is an amenable number.

520332661 is a deficient number, since it is larger than the sum of its proper divisors (1).

520332661 is an equidigital number, since it uses as much as digits as its factorization.

520332661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 28.

The square root of 520332661 is about 22810.8014107352. The cubic root of 520332661 is about 804.3165944781.

Adding to 520332661 its reverse (166233025), we get a palindrome (686565686).

The spelling of 520332661 in words is "five hundred twenty million, three hundred thirty-two thousand, six hundred sixty-one".