665690603 has 2 divisors, whose sum is σ = 665690604. Its totient is φ = 665690602.

The previous prime is 665690579. The next prime is 665690629. The reversal of 665690603 is 306096566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 665690603 - 2¹⁶ = 665625067 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (665690503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332845301 + 332845302.

It is an arithmetic number, because the mean of its divisors is an integer number (332845302).

Almost surely, 2^665690603 is an apocalyptic number.

665690603 is a deficient number, since it is larger than the sum of its proper divisors (1).

665690603 is an equidigital number, since it uses as much as digits as its factorization.

665690603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 174960, while the sum is 41.

The square root of 665690603 is about 25800.9806596571. The cubic root of 665690603 is about 873.1539214260.

The spelling of 665690603 in words is "six hundred sixty-five million, six hundred ninety thousand, six hundred three".