1656665451611 has 2 divisors, whose sum is σ = 1656665451612. Its totient is φ = 1656665451610.

The previous prime is 1656665451499. The next prime is 1656665451631. The reversal of 1656665451611 is 1161545666561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1656665451611 - 2³⁸ = 1381787544667 is a prime.

It is a super-2 number, since 2×1656665451611² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1656665451631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 828332725805 + 828332725806.

It is an arithmetic number, because the mean of its divisors is an integer number (828332725806).

Almost surely, 2^{1656665451611} is an apocalyptic number.

1656665451611 is a deficient number, since it is larger than the sum of its proper divisors (1).

1656665451611 is an equidigital number, since it uses as much as digits as its factorization.

1656665451611 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3888000, while the sum is 53.

The spelling of 1656665451611 in words is "one trillion, six hundred fifty-six billion, six hundred sixty-five million, four hundred fifty-one thousand, six hundred eleven".