520601155363561 has 4 divisors (see below), whose sum is σ = 521488039785552. Its totient is φ = 519714270941572.

The previous prime is 520601155363547. The next prime is 520601155363589. The reversal of 520601155363561 is 165363551106025.

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.

It is a cyclic number.

It is not a de Polignac number, because 520601155363561 - 2⁵ = 520601155363529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520601155366561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 443442210115 + ... + 443442211288.

It is an arithmetic number, because the mean of its divisors is an integer number (130372009946388).

Almost surely, 2^{520601155363561} is an apocalyptic number.

It is an amenable number.

520601155363561 is a deficient number, since it is larger than the sum of its proper divisors (886884421991).

520601155363561 is an equidigital number, since it uses as much as digits as its factorization.

520601155363561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 886884421990.

The product of its (nonzero) digits is 2430000, while the sum is 49.

The spelling of 520601155363561 in words is "five hundred twenty trillion, six hundred one billion, one hundred fifty-five million, three hundred sixty-three thousand, five hundred sixty-one".