16235856401 has 4 divisors (see below), whose sum is σ = 16255442100. Its totient is φ = 16216270704.

The previous prime is 16235856397. The next prime is 16235856449. The reversal of 16235856401 is 10465853261.

16235856401 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 127420²+1.

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 9347022400 + 6888834001 = 96680^2 + 82999^2 .

It is a cyclic number.

It is not a de Polignac number, because 16235856401 - 2² = 16235856397 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16235856491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9791606 + ... + 9793263.

It is an arithmetic number, because the mean of its divisors is an integer number (4063860525).

Almost surely, 2^16235856401 is an apocalyptic number.

It is an amenable number.

16235856401 is a deficient number, since it is larger than the sum of its proper divisors (19585699).

16235856401 is an equidigital number, since it uses as much as digits as its factorization.

16235856401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19585698.

The product of its (nonzero) digits is 172800, while the sum is 41.

The spelling of 16235856401 in words is "sixteen billion, two hundred thirty-five million, eight hundred fifty-six thousand, four hundred one".