1656135665291 has 2 divisors, whose sum is σ = 1656135665292. Its totient is φ = 1656135665290.

The previous prime is 1656135665267. The next prime is 1656135665411. The reversal of 1656135665291 is 1925665316561.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1656135665291 is a prime.

It is a super-2 number, since 2×1656135665291² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1656135664291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 828067832645 + 828067832646.

It is an arithmetic number, because the mean of its divisors is an integer number (828067832646).

Almost surely, 2^{1656135665291} is an apocalyptic number.

1656135665291 is a deficient number, since it is larger than the sum of its proper divisors (1).

1656135665291 is an equidigital number, since it uses as much as digits as its factorization.

1656135665291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8748000, while the sum is 56.

The spelling of 1656135665291 in words is "one trillion, six hundred fifty-six billion, one hundred thirty-five million, six hundred sixty-five thousand, two hundred ninety-one".