16563353401 has 4 divisors (see below), whose sum is σ = 18929546752. Its totient is φ = 14197160052.

The previous prime is 16563353399. The next prime is 16563353431. The reversal of 16563353401 is 10435336561.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16563353401 - 2¹ = 16563353399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16563353431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1183096665 + ... + 1183096678.

It is an arithmetic number, because the mean of its divisors is an integer number (4732386688).

Almost surely, 2^16563353401 is an apocalyptic number.

It is an amenable number.

16563353401 is a deficient number, since it is larger than the sum of its proper divisors (2366193351).

16563353401 is an equidigital number, since it uses as much as digits as its factorization.

16563353401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2366193350.

The product of its (nonzero) digits is 97200, while the sum is 37.

Adding to 16563353401 its reverse (10435336561), we get a palindrome (26998689962).

The spelling of 16563353401 in words is "sixteen billion, five hundred sixty-three million, three hundred fifty-three thousand, four hundred one".