1611605404266 has 256 divisors, whose sum is σ = 4128227389440. Its totient is φ = 411771064320.

The previous prime is 1611605404247. The next prime is 1611605404267. The reversal of 1611605404266 is 6624045061161.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1611605404267) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 226123195 + ... + 226130321.

It is an arithmetic number, because the mean of its divisors is an integer number (16125888240).

Almost surely, 2^{1611605404266} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1611605404266, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2064113694720).

1611605404266 is an abundant number, since it is smaller than the sum of its proper divisors (2516621985174).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1611605404266 is a wasteful number, since it uses less digits than its factorization.

1611605404266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7629.

The product of its (nonzero) digits is 207360, while the sum is 42.

The spelling of 1611605404266 in words is "one trillion, six hundred eleven billion, six hundred five million, four hundred four thousand, two hundred sixty-six".