1997023966266 has 32 divisors (see below), whose sum is σ = 4597465259520. Its totient is φ = 566473394736.

The previous prime is 1997023966253. The next prime is 1997023966337. The reversal of 1997023966266 is 6626693207991.

It is a junction number, because it is equal to n+sod(n) for n = 1997023966197 and 1997023966206.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 171030816 + ... + 171042491.

It is an arithmetic number, because the mean of its divisors is an integer number (143670789360).

Almost surely, 2^{1997023966266} is an apocalyptic number.

1997023966266 is an abundant number, since it is smaller than the sum of its proper divisors (2600441293254).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1997023966266 is a wasteful number, since it uses less digits than its factorization.

1997023966266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342073458.

The product of its (nonzero) digits is 79361856, while the sum is 66.

The spelling of 1997023966266 in words is "one trillion, nine hundred ninety-seven billion, twenty-three million, nine hundred sixty-six thousand, two hundred sixty-six".