16256654517641 has 4 divisors (see below), whose sum is σ = 16256664435972. Its totient is φ = 16256644599312.

The previous prime is 16256654517637. The next prime is 16256654517647. The reversal of 16256654517641 is 14671545665261.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 11250516764041 + 5006137753600 = 3354179^2 + 2237440^2 .

It is a cyclic number.

It is not a de Polignac number, because 16256654517641 - 2² = 16256654517637 is a prime.

It is a super-2 number, since 2×16256654517641² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16256654517647) 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, 1851410 + ... + 5995083.

It is an arithmetic number, because the mean of its divisors is an integer number (4064166108993).

Almost surely, 2^{16256654517641} is an apocalyptic number.

It is an amenable number.

16256654517641 is a deficient number, since it is larger than the sum of its proper divisors (9918331).

16256654517641 is an equidigital number, since it uses as much as digits as its factorization.

16256654517641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9918330.

The product of its digits is 36288000, while the sum is 59.

The spelling of 16256654517641 in words is "sixteen trillion, two hundred fifty-six billion, six hundred fifty-four million, five hundred seventeen thousand, six hundred forty-one".