1605616356061 has 2 divisors, whose sum is σ = 1605616356062. Its totient is φ = 1605616356060.

The previous prime is 1605616356053. The next prime is 1605616356107. The reversal of 1605616356061 is 1606536165061.

It is an a-pointer prime, because the next prime (1605616356107) can be obtained adding 1605616356061 to its sum of digits (46).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 947215562500 + 658400793561 = 973250^2 + 811419^2 .

It is a cyclic number.

It is not a de Polignac number, because 1605616356061 - 2³ = 1605616356053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1605616356041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 802808178030 + 802808178031.

It is an arithmetic number, because the mean of its divisors is an integer number (802808178031).

Almost surely, 2^{1605616356061} is an apocalyptic number.

It is an amenable number.

1605616356061 is a deficient number, since it is larger than the sum of its proper divisors (1).

1605616356061 is an equidigital number, since it uses as much as digits as its factorization.

1605616356061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 583200, while the sum is 46.

The spelling of 1605616356061 in words is "one trillion, six hundred five billion, six hundred sixteen million, three hundred fifty-six thousand, sixty-one".