331666403 has 2 divisors, whose sum is σ = 331666404. Its totient is φ = 331666402.

The previous prime is 331666397. The next prime is 331666441. The reversal of 331666403 is 304666133.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 331666403 - 2¹⁰ = 331665379 is a prime.

It is a super-2 number, since 2×331666403² = 220005205757916818, 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 331666403.

It is not a weakly prime, because it can be changed into another prime (331666493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165833201 + 165833202.

It is an arithmetic number, because the mean of its divisors is an integer number (165833202).

Almost surely, 2^331666403 is an apocalyptic number.

331666403 is a deficient number, since it is larger than the sum of its proper divisors (1).

331666403 is an equidigital number, since it uses as much as digits as its factorization.

331666403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 32.

The square root of 331666403 is about 18211.7106005998. The cubic root of 331666403 is about 692.2035574270.

The spelling of 331666403 in words is "three hundred thirty-one million, six hundred sixty-six thousand, four hundred three".