1645571361611 has 2 divisors, whose sum is σ = 1645571361612. Its totient is φ = 1645571361610.

The previous prime is 1645571361587. The next prime is 1645571361617. The reversal of 1645571361611 is 1161631755461.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1645571361611 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1645571361617) 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, 822785680805 + 822785680806.

It is an arithmetic number, because the mean of its divisors is an integer number (822785680806).

Almost surely, 2^{1645571361611} is an apocalyptic number.

1645571361611 is a deficient number, since it is larger than the sum of its proper divisors (1).

1645571361611 is an equidigital number, since it uses as much as digits as its factorization.

1645571361611 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 453600, while the sum is 47.

The spelling of 1645571361611 in words is "one trillion, six hundred forty-five billion, five hundred seventy-one million, three hundred sixty-one thousand, six hundred eleven".