16426780695561 has 4 divisors (see below), whose sum is σ = 21902374260752. Its totient is φ = 10951187130372.

The previous prime is 16426780695547. The next prime is 16426780695581. The reversal of 16426780695561 is 16559608762461.

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 16426780695561 - 2¹¹ = 16426780693513 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16426780695492 and 16426780695501.

It is not an unprimeable number, because it can be changed into a prime (16426780695581) 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, 2737796782591 + ... + 2737796782596.

It is an arithmetic number, because the mean of its divisors is an integer number (5475593565188).

Almost surely, 2^{16426780695561} is an apocalyptic number.

It is an amenable number.

16426780695561 is a deficient number, since it is larger than the sum of its proper divisors (5475593565191).

16426780695561 is an equidigital number, since it uses as much as digits as its factorization.

16426780695561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5475593565190.

The product of its (nonzero) digits is 130636800, while the sum is 66.

The spelling of 16426780695561 in words is "sixteen trillion, four hundred twenty-six billion, seven hundred eighty million, six hundred ninety-five thousand, five hundred sixty-one".