1806161867969 has 2 divisors, whose sum is σ = 1806161867970. Its totient is φ = 1806161867968.

The previous prime is 1806161867929. The next prime is 1806161867999. The reversal of 1806161867969 is 9697681616081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1754861882944 + 51299985025 = 1324712^2 + 226495^2 .

It is an emirp because it is prime and its reverse (9697681616081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1806161867969 - 2³⁶ = 1737442391233 is a prime.

It is a super-2 number, since 2×1806161867969² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1806161867899 and 1806161867908.

It is not a weakly prime, because it can be changed into another prime (1806161867929) 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, 903080933984 + 903080933985.

It is an arithmetic number, because the mean of its divisors is an integer number (903080933985).

Almost surely, 2^{1806161867969} is an apocalyptic number.

It is an amenable number.

1806161867969 is a deficient number, since it is larger than the sum of its proper divisors (1).

1806161867969 is an equidigital number, since it uses as much as digits as its factorization.

1806161867969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 47029248, while the sum is 68.

The spelling of 1806161867969 in words is "one trillion, eight hundred six billion, one hundred sixty-one million, eight hundred sixty-seven thousand, nine hundred sixty-nine".