216820028613 has 16 divisors (see below), whose sum is σ = 290651775296. Its totient is φ = 143769375360.

The previous prime is 216820028609. The next prime is 216820028671. The reversal of 216820028613 is 316820028612.

It is not a de Polignac number, because 216820028613 - 2² = 216820028609 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 (216820028603) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 223281 + ... + 695337.

It is an arithmetic number, because the mean of its divisors is an integer number (18165735956).

Almost surely, 2^216820028613 is an apocalyptic number.

It is an amenable number.

216820028613 is a deficient number, since it is larger than the sum of its proper divisors (73831746683).

216820028613 is a wasteful number, since it uses less digits than its factorization.

216820028613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 472884.

The product of its (nonzero) digits is 55296, while the sum is 39.

Subtracting 216820028613 from its reverse (316820028612), we obtain a palindrome (99999999999).

The spelling of 216820028613 in words is "two hundred sixteen billion, eight hundred twenty million, twenty-eight thousand, six hundred thirteen".