16938410390861 has 4 divisors (see below), whose sum is σ = 17046298355292. Its totient is φ = 16830522426432.

The previous prime is 16938410390849. The next prime is 16938410390879. The reversal of 16938410390861 is 16809301483961.

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 13048024962025 + 3890385428836 = 3612205^2 + 1972406^2 .

It is a cyclic number.

It is not a de Polignac number, because 16938410390861 - 2²² = 16938406196557 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 16938410390861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16938410390261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53943981980 + ... + 53943982293.

It is an arithmetic number, because the mean of its divisors is an integer number (4261574588823).

Almost surely, 2^{16938410390861} is an apocalyptic number.

It is an amenable number.

16938410390861 is a deficient number, since it is larger than the sum of its proper divisors (107887964431).

16938410390861 is a wasteful number, since it uses less digits than its factorization.

16938410390861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107887964430.

The product of its (nonzero) digits is 6718464, while the sum is 59.

The spelling of 16938410390861 in words is "sixteen trillion, nine hundred thirty-eight billion, four hundred ten million, three hundred ninety thousand, eight hundred sixty-one".