1866495823169 has 2 divisors, whose sum is σ = 1866495823170. Its totient is φ = 1866495823168.

The previous prime is 1866495823147. The next prime is 1866495823237. The reversal of 1866495823169 is 9613285946681.

It is an a-pointer prime, because the next prime (1866495823237) can be obtained adding 1866495823169 to its sum of digits (68).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1145927430400 + 720568392769 = 1070480^2 + 848863^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1866495823169 is a prime.

It is a super-2 number, since 2×1866495823169² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1866495823099 and 1866495823108.

It is not a weakly prime, because it can be changed into another prime (1866495823369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 933247911584 + 933247911585.

It is an arithmetic number, because the mean of its divisors is an integer number (933247911585).

Almost surely, 2^{1866495823169} is an apocalyptic number.

It is an amenable number.

1866495823169 is a deficient number, since it is larger than the sum of its proper divisors (1).

1866495823169 is an equidigital number, since it uses as much as digits as its factorization.

1866495823169 is an evil number, because the sum of its binary digits is even.

The product of its digits is 134369280, while the sum is 68.

The spelling of 1866495823169 in words is "one trillion, eight hundred sixty-six billion, four hundred ninety-five million, eight hundred twenty-three thousand, one hundred sixty-nine".