1331666423243 has 16 divisors (see below), whose sum is σ = 1499578859520. Its totient is φ = 1173330944544.

The previous prime is 1331666423239. The next prime is 1331666423261. The reversal of 1331666423243 is 3423246661331.

It is a cyclic number.

It is not a de Polignac number, because 1331666423243 - 2² = 1331666423239 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1331666423194 and 1331666423203.

It is not an unprimeable number, because it can be changed into a prime (1331666423233) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4505771 + ... + 4792212.

It is an arithmetic number, because the mean of its divisors is an integer number (93723678720).

Almost surely, 2^{1331666423243} is an apocalyptic number.

1331666423243 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1331666423243 is a deficient number, since it is larger than the sum of its proper divisors (167912436277).

1331666423243 is a wasteful number, since it uses less digits than its factorization.

1331666423243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9298498.

The product of its digits is 1119744, while the sum is 44.

The spelling of 1331666423243 in words is "one trillion, three hundred thirty-one billion, six hundred sixty-six million, four hundred twenty-three thousand, two hundred forty-three".