1611821250667 has 2 divisors, whose sum is σ = 1611821250668. Its totient is φ = 1611821250666.

The previous prime is 1611821250623. The next prime is 1611821250811. The reversal of 1611821250667 is 7660521281161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1611821250667 - 2⁷ = 1611821250539 is a prime.

It is not a weakly prime, because it can be changed into another prime (1611821250617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 805910625333 + 805910625334.

It is an arithmetic number, because the mean of its divisors is an integer number (805910625334).

Almost surely, 2^{1611821250667} is an apocalyptic number.

1611821250667 is a deficient number, since it is larger than the sum of its proper divisors (1).

1611821250667 is an equidigital number, since it uses as much as digits as its factorization.

1611821250667 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 241920, while the sum is 46.

The spelling of 1611821250667 in words is "one trillion, six hundred eleven billion, eight hundred twenty-one million, two hundred fifty thousand, six hundred sixty-seven".