520656620642 has 4 divisors (see below), whose sum is σ = 780984930966. Its totient is φ = 260328310320.

The previous prime is 520656620623. The next prime is 520656620681. The reversal of 520656620642 is 246026656025.

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

It can be written as a sum of positive squares in only one way, i.e., 416281749601 + 104374871041 = 645199^2 + 323071^2 .

It is a junction number, because it is equal to n+sod(n) for n = 520656620593 and 520656620602.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 130164155159 + ... + 130164155162.

Almost surely, 2^520656620642 is an apocalyptic number.

520656620642 is a deficient number, since it is larger than the sum of its proper divisors (260328310324).

520656620642 is a wasteful number, since it uses less digits than its factorization.

520656620642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260328310323.

The product of its (nonzero) digits is 1036800, while the sum is 44.

The spelling of 520656620642 in words is "five hundred twenty billion, six hundred fifty-six million, six hundred twenty thousand, six hundred forty-two".