520063631006661 has 96 divisors (see below), whose sum is σ = 863454882850560. Its totient is φ = 295474463539200.

The previous prime is 520063631006627. The next prime is 520063631006747. The reversal of 520063631006661 is 166600136360025.

It is not a de Polignac number, because 520063631006661 - 2⁶ = 520063631006597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520063631206661) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 33962222541 + ... + 33962237853.

It is an arithmetic number, because the mean of its divisors is an integer number (8994321696360).

Almost surely, 2^{520063631006661} is an apocalyptic number.

It is an amenable number.

520063631006661 is a deficient number, since it is larger than the sum of its proper divisors (343391251843899).

520063631006661 is a wasteful number, since it uses less digits than its factorization.

520063631006661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18987 (or 18984 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 45.

Adding to 520063631006661 its reverse (166600136360025), we get a palindrome (686663767366686).

The spelling of 520063631006661 in words is "five hundred twenty trillion, sixty-three billion, six hundred thirty-one million, six thousand, six hundred sixty-one".