665346403 has 2 divisors, whose sum is σ = 665346404. Its totient is φ = 665346402.

The previous prime is 665346359. The next prime is 665346419. The reversal of 665346403 is 304643566.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665346403 is a prime.

It is not a weakly prime, because it can be changed into another prime (665346433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332673201 + 332673202.

It is an arithmetic number, because the mean of its divisors is an integer number (332673202).

Almost surely, 2^665346403 is an apocalyptic number.

665346403 is a deficient number, since it is larger than the sum of its proper divisors (1).

665346403 is an equidigital number, since it uses as much as digits as its factorization.

665346403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 155520, while the sum is 37.

The square root of 665346403 is about 25794.3095081066. The cubic root of 665346403 is about 873.0034053595.

Adding to 665346403 its reverse (304643566), we get a palindrome (969989969).

The spelling of 665346403 in words is "six hundred sixty-five million, three hundred forty-six thousand, four hundred three".