520726466609 has 4 divisors (see below), whose sum is σ = 520728959604. Its totient is φ = 520723973616.

The previous prime is 520726466551. The next prime is 520726466621. The reversal of 520726466609 is 906664627025.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 510860415025 + 9866051584 = 714745^2 + 99328^2 .

It is a cyclic number.

It is not a de Polignac number, because 520726466609 - 2³⁶ = 452006989873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520726466699) 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, 901322 + ... + 1361555.

It is an arithmetic number, because the mean of its divisors is an integer number (130182239901).

Almost surely, 2^520726466609 is an apocalyptic number.

It is an amenable number.

520726466609 is a deficient number, since it is larger than the sum of its proper divisors (2492995).

520726466609 is a wasteful number, since it uses less digits than its factorization.

520726466609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2492994.

The product of its (nonzero) digits is 6531840, while the sum is 53.

The spelling of 520726466609 in words is "five hundred twenty billion, seven hundred twenty-six million, four hundred sixty-six thousand, six hundred nine".