520644072601 has 4 divisors (see below), whose sum is σ = 520645539712. Its totient is φ = 520642605492.

The previous prime is 520644072593. The next prime is 520644072643. The reversal of 520644072601 is 106270446025.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 520644072601 - 2³ = 520644072593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520644072401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168580 + ... + 1034266.

It is an arithmetic number, because the mean of its divisors is an integer number (130161384928).

Almost surely, 2^520644072601 is an apocalyptic number.

It is an amenable number.

520644072601 is a deficient number, since it is larger than the sum of its proper divisors (1467111).

520644072601 is an equidigital number, since it uses as much as digits as its factorization.

520644072601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1467110.

The product of its (nonzero) digits is 80640, while the sum is 37.

The spelling of 520644072601 in words is "five hundred twenty billion, six hundred forty-four million, seventy-two thousand, six hundred one".