1611821250811 has 2 divisors, whose sum is σ = 1611821250812. Its totient is φ = 1611821250810.

The previous prime is 1611821250667. The next prime is 1611821250827. The reversal of 1611821250811 is 1180521281161.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1611821250811 - 2³⁹ = 1062065436923 is a prime.

It is not a weakly prime, because it can be changed into another prime (1611821250841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 805910625405 + 805910625406.

It is an arithmetic number, because the mean of its divisors is an integer number (805910625406).

Almost surely, 2^{1611821250811} is an apocalyptic number.

1611821250811 is a deficient number, since it is larger than the sum of its proper divisors (1).

1611821250811 is an equidigital number, since it uses as much as digits as its factorization.

1611821250811 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7680, while the sum is 37.

The spelling of 1611821250811 in words is "one trillion, six hundred eleven billion, eight hundred twenty-one million, two hundred fifty thousand, eight hundred eleven".