1311666373 has 2 divisors, whose sum is σ = 1311666374. Its totient is φ = 1311666372.

The previous prime is 1311666299. The next prime is 1311666397. The reversal of 1311666373 is 3736661131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1276061284 + 35605089 = 35722^2 + 5967^2 .

It is a cyclic number.

It is not a de Polignac number, because 1311666373 - 2²⁵ = 1278111941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1311616373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655833186 + 655833187.

It is an arithmetic number, because the mean of its divisors is an integer number (655833187).

Almost surely, 2^1311666373 is an apocalyptic number.

It is an amenable number.

1311666373 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311666373 is an equidigital number, since it uses as much as digits as its factorization.

1311666373 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40824, while the sum is 37.

The square root of 1311666373 is about 36216.9348923953. The cubic root of 1311666373 is about 1094.6479336309.

The spelling of 1311666373 in words is "one billion, three hundred eleven million, six hundred sixty-six thousand, three hundred seventy-three".