16643416253 has 4 divisors (see below), whose sum is σ = 16830421020. Its totient is φ = 16456411488.

The previous prime is 16643416247. The next prime is 16643416277. The reversal of 16643416253 is 35261434661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 35261434661 = 199 ⋅177193139.

It can be written as a sum of positive squares in 2 ways, for example, as 8247909124 + 8395507129 = 90818^2 + 91627^2 .

It is a cyclic number.

It is not a de Polignac number, because 16643416253 - 2¹² = 16643412157 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 16643416253.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16643419253) 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, 93502250 + ... + 93502427.

It is an arithmetic number, because the mean of its divisors is an integer number (4207605255).

Almost surely, 2^16643416253 is an apocalyptic number.

It is an amenable number.

16643416253 is a deficient number, since it is larger than the sum of its proper divisors (187004767).

16643416253 is an equidigital number, since it uses as much as digits as its factorization.

16643416253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187004766.

The product of its digits is 311040, while the sum is 41.

The spelling of 16643416253 in words is "sixteen billion, six hundred forty-three million, four hundred sixteen thousand, two hundred fifty-three".