12191817669669 has 12 divisors (see below), whose sum is σ = 19211349055392. Its totient is φ = 7388980405800.

The previous prime is 12191817669649. The next prime is 12191817669721. The reversal of 12191817669669 is 96696671819121.

It is not a de Polignac number, because 12191817669669 - 2⁵ = 12191817669637 is a prime.

It is a super-2 number, since 2×12191817669669² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12191817669597 and 12191817669606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12191817669649) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61574836617 + ... + 61574836814.

It is an arithmetic number, because the mean of its divisors is an integer number (1600945754616).

Almost surely, 2^{12191817669669} is an apocalyptic number.

It is an amenable number.

12191817669669 is a deficient number, since it is larger than the sum of its proper divisors (7019531385723).

12191817669669 is a wasteful number, since it uses less digits than its factorization.

12191817669669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123149673448 (or 123149673445 counting only the distinct ones).

The product of its digits is 105815808, while the sum is 72.

The spelling of 12191817669669 in words is "twelve trillion, one hundred ninety-one billion, eight hundred seventeen million, six hundred sixty-nine thousand, six hundred sixty-nine".