1605461216713 has 4 divisors (see below), whose sum is σ = 1611257105860. Its totient is φ = 1599665327568.

The previous prime is 1605461216707. The next prime is 1605461216743. The reversal of 1605461216713 is 3176121645061.

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 144135641104 + 1461325575609 = 379652^2 + 1208853^2 .

It is a cyclic number.

It is not a de Polignac number, because 1605461216713 - 2²⁵ = 1605427662281 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 1605461216713.

It is not an unprimeable number, because it can be changed into a prime (1605461216743) 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, 2897944158 + ... + 2897944711.

It is an arithmetic number, because the mean of its divisors is an integer number (402814276465).

Almost surely, 2^{1605461216713} is an apocalyptic number.

It is an amenable number.

1605461216713 is a deficient number, since it is larger than the sum of its proper divisors (5795889147).

1605461216713 is an equidigital number, since it uses as much as digits as its factorization.

1605461216713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5795889146.

The product of its (nonzero) digits is 181440, while the sum is 43.

The spelling of 1605461216713 in words is "one trillion, six hundred five billion, four hundred sixty-one million, two hundred sixteen thousand, seven hundred thirteen".