520643666346025 has 6 divisors (see below), whose sum is σ = 645598146269102. Its totient is φ = 416514933076800.

The previous prime is 520643666346007. The next prime is 520643666346043.

520643666346025 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (520643666346007) and next prime (520643666346043).

It can be written as a sum of positive squares in 3 ways, for example, as 113007445206016 + 407636221140009 = 10630496^2 + 20190003^2 .

It is not a de Polignac number, because 520643666346025 - 2³⁷ = 520506227392553 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10412873326896 + ... + 10412873326945.

Almost surely, 2^{520643666346025} is an apocalyptic number.

It is an amenable number.

520643666346025 is a deficient number, since it is larger than the sum of its proper divisors (124954479923077).

520643666346025 is a wasteful number, since it uses less digits than its factorization.

520643666346025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20825746653851 (or 20825746653846 counting only the distinct ones).

The product of its (nonzero) digits is 111974400, while the sum is 58.

The spelling of 520643666346025 in words is "five hundred twenty trillion, six hundred forty-three billion, six hundred sixty-six million, three hundred forty-six thousand, twenty-five".