1809229991668 has 24 divisors (see below), whose sum is σ = 3573087446880. Its totient is φ = 794019431520.

The previous prime is 1809229991651. The next prime is 1809229991711. The reversal of 1809229991668 is 8661999229081.

It is a junction number, because it is equal to n+sod(n) for n = 1809229991597 and 1809229991606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 708944646 + ... + 708947197.

It is an arithmetic number, because the mean of its divisors is an integer number (148878643620).

Almost surely, 2^{1809229991668} is an apocalyptic number.

It is an amenable number.

1809229991668 is a deficient number, since it is larger than the sum of its proper divisors (1763857455212).

1809229991668 is a wasteful number, since it uses less digits than its factorization.

1809229991668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1417891887 (or 1417891885 counting only the distinct ones).

The product of its (nonzero) digits is 60466176, while the sum is 70.

The spelling of 1809229991668 in words is "one trillion, eight hundred nine billion, two hundred twenty-nine million, nine hundred ninety-one thousand, six hundred sixty-eight".