516221565103 has 4 divisors (see below), whose sum is σ = 516763246608. Its totient is φ = 515679883600.

The previous prime is 516221565073. The next prime is 516221565113. The reversal of 516221565103 is 301565122615.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 516221565103 - 2¹³ = 516221556911 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (516221565113) 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, 270839323 + ... + 270841228.

It is an arithmetic number, because the mean of its divisors is an integer number (129190811652).

Almost surely, 2^516221565103 is an apocalyptic number.

516221565103 is a deficient number, since it is larger than the sum of its proper divisors (541681505).

516221565103 is an equidigital number, since it uses as much as digits as its factorization.

516221565103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 541681504.

The product of its (nonzero) digits is 54000, while the sum is 37.

Adding to 516221565103 its reverse (301565122615), we get a palindrome (817786687718).

The spelling of 516221565103 in words is "five hundred sixteen billion, two hundred twenty-one million, five hundred sixty-five thousand, one hundred three".