1809229991669 has 4 divisors (see below), whose sum is σ = 1810951429440. Its totient is φ = 1807508553900.

The previous prime is 1809229991651. The next prime is 1809229991711. The reversal of 1809229991669 is 9661999229081.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1809229991669 - 2²⁴ = 1809213214453 is a prime.

It is a super-2 number, since 2×1809229991669² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1809289991669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 860717309 + ... + 860719410.

It is an arithmetic number, because the mean of its divisors is an integer number (452737857360).

Almost surely, 2^{1809229991669} is an apocalyptic number.

It is an amenable number.

1809229991669 is a deficient number, since it is larger than the sum of its proper divisors (1721437771).

1809229991669 is a wasteful number, since it uses less digits than its factorization.

1809229991669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1721437770.

The product of its (nonzero) digits is 68024448, while the sum is 71.

The spelling of 1809229991669 in words is "one trillion, eight hundred nine billion, two hundred twenty-nine million, nine hundred ninety-one thousand, six hundred sixty-nine".