16420639453 has 4 divisors (see below), whose sum is σ = 16422506460. Its totient is φ = 16418772448.

The previous prime is 16420639451. The next prime is 16420639583. The reversal of 16420639453 is 35493602461.

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 16410122404 + 10517049 = 128102^2 + 3243^2 .

It is a cyclic number.

It is not a de Polignac number, because 16420639453 - 2¹ = 16420639451 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 (16420639451) 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, 920248 + ... + 937921.

It is an arithmetic number, because the mean of its divisors is an integer number (4105626615).

Almost surely, 2^16420639453 is an apocalyptic number.

It is an amenable number.

16420639453 is a deficient number, since it is larger than the sum of its proper divisors (1867007).

16420639453 is an equidigital number, since it uses as much as digits as its factorization.

16420639453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1867006.

The product of its (nonzero) digits is 466560, while the sum is 43.

The spelling of 16420639453 in words is "sixteen billion, four hundred twenty million, six hundred thirty-nine thousand, four hundred fifty-three".