16420638613 has 4 divisors (see below), whose sum is σ = 16423875468. Its totient is φ = 16417401760.

The previous prime is 16420638581. The next prime is 16420638629. The reversal of 16420638613 is 31683602461.

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 6910098129 + 9510540484 = 83127^2 + 97522^2 .

It is a cyclic number.

It is not a de Polignac number, because 16420638613 - 2⁵ = 16420638581 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16420638643) 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, 1610806 + ... + 1620967.

It is an arithmetic number, because the mean of its divisors is an integer number (4105968867).

Almost surely, 2^16420638613 is an apocalyptic number.

It is an amenable number.

16420638613 is a deficient number, since it is larger than the sum of its proper divisors (3236855).

16420638613 is an equidigital number, since it uses as much as digits as its factorization.

16420638613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3236854.

The product of its (nonzero) digits is 124416, while the sum is 40.

The spelling of 16420638613 in words is "sixteen billion, four hundred twenty million, six hundred thirty-eight thousand, six hundred thirteen".