520244543253551 has 4 divisors (see below), whose sum is σ = 520343430265704. Its totient is φ = 520145656241400.

The previous prime is 520244543253541. The next prime is 520244543253577. The reversal of 520244543253551 is 155352345442025.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-520244543253551 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 520244543253551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520244543253521) 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, 49443498185 + ... + 49443508706.

It is an arithmetic number, because the mean of its divisors is an integer number (130085857566426).

Almost surely, 2^{520244543253551} is an apocalyptic number.

520244543253551 is a deficient number, since it is larger than the sum of its proper divisors (98887012153).

520244543253551 is an equidigital number, since it uses as much as digits as its factorization.

520244543253551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98887012152.

The product of its (nonzero) digits is 14400000, while the sum is 50.

Adding to 520244543253551 its reverse (155352345442025), we get a palindrome (675596888695576).

The spelling of 520244543253551 in words is "five hundred twenty trillion, two hundred forty-four billion, five hundred forty-three million, two hundred fifty-three thousand, five hundred fifty-one".