1605422605691 has 2 divisors, whose sum is σ = 1605422605692. Its totient is φ = 1605422605690.

The previous prime is 1605422605687. The next prime is 1605422605727. The reversal of 1605422605691 is 1965062245061.

It is a weak prime.

It is an emirp because it is prime and its reverse (1965062245061) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1605422605691 - 2² = 1605422605687 is a prime.

It is not a weakly prime, because it can be changed into another prime (1605422605621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 802711302845 + 802711302846.

It is an arithmetic number, because the mean of its divisors is an integer number (802711302846).

Almost surely, 2^{1605422605691} is an apocalyptic number.

1605422605691 is a deficient number, since it is larger than the sum of its proper divisors (1).

1605422605691 is an equidigital number, since it uses as much as digits as its factorization.

1605422605691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 777600, while the sum is 47.

The spelling of 1605422605691 in words is "one trillion, six hundred five billion, four hundred twenty-two million, six hundred five thousand, six hundred ninety-one".