16555335402261 has 4 divisors (see below), whose sum is σ = 22073780536352. Its totient is φ = 11036890268172.

The previous prime is 16555335402259. The next prime is 16555335402289. The reversal of 16555335402261 is 16220453355561.

16555335402261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 16555335402261 - 2¹ = 16555335402259 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 16555335402261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16555335402241) 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, 2759222567041 + ... + 2759222567046.

It is an arithmetic number, because the mean of its divisors is an integer number (5518445134088).

Almost surely, 2^{16555335402261} is an apocalyptic number.

It is an amenable number.

16555335402261 is a deficient number, since it is larger than the sum of its proper divisors (5518445134091).

16555335402261 is an equidigital number, since it uses as much as digits as its factorization.

16555335402261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5518445134090.

The product of its (nonzero) digits is 3240000, while the sum is 48.

The spelling of 16555335402261 in words is "sixteen trillion, five hundred fifty-five billion, three hundred thirty-five million, four hundred two thousand, two hundred sixty-one".