1641806134469 has 2 divisors, whose sum is σ = 1641806134470. Its totient is φ = 1641806134468.

The previous prime is 1641806134307. The next prime is 1641806134487. The reversal of 1641806134469 is 9644316081461.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1625466903844 + 16339230625 = 1274938^2 + 127825^2 .

It is an emirp because it is prime and its reverse (9644316081461) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1641806134469 is a prime.

It is a super-2 number, since 2×1641806134469² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1641806134469.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1641806130469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820903067234 + 820903067235.

It is an arithmetic number, because the mean of its divisors is an integer number (820903067235).

Almost surely, 2^{1641806134469} is an apocalyptic number.

It is an amenable number.

1641806134469 is a deficient number, since it is larger than the sum of its proper divisors (1).

1641806134469 is an equidigital number, since it uses as much as digits as its factorization.

1641806134469 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2985984, while the sum is 53.

The spelling of 1641806134469 in words is "one trillion, six hundred forty-one billion, eight hundred six million, one hundred thirty-four thousand, four hundred sixty-nine".