1331666123 has 2 divisors, whose sum is σ = 1331666124. Its totient is φ = 1331666122.

The previous prime is 1331666069. The next prime is 1331666179. The reversal of 1331666123 is 3216661331.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1331666123 - 2¹⁶ = 1331600587 is a prime.

It is a super-2 number, since 2×1331666123² = 3546669326291702258, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1331666123.

It is not a weakly prime, because it can be changed into another prime (1331666723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665833061 + 665833062.

It is an arithmetic number, because the mean of its divisors is an integer number (665833062).

Almost surely, 2^1331666123 is an apocalyptic number.

1331666123 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331666123 is an equidigital number, since it uses as much as digits as its factorization.

1331666123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11664, while the sum is 32.

The square root of 1331666123 is about 36492.0008083964. Note that the first 3 decimals coincide. The cubic root of 1331666123 is about 1100.1834743544.

The spelling of 1331666123 in words is "one billion, three hundred thirty-one million, six hundred sixty-six thousand, one hundred twenty-three".