665419 has 2 divisors, whose sum is σ = 665420. Its totient is φ = 665418.

The previous prime is 665387. The next prime is 665429. The reversal of 665419 is 914566.

665419 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 665419 - 2⁵ = 665387 is a prime.

It is a super-2 number, since 2×665419² = 885564891122, which contains 22 as substring.

It is a Chen prime.

It is a plaindrome in base 14.

It is not a weakly prime, because it can be changed into another prime (665429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332709 + 332710.

It is an arithmetic number, because the mean of its divisors is an integer number (332710).

2⁶⁶⁵⁴¹⁹ is an apocalyptic number.

665419 is a deficient number, since it is larger than the sum of its proper divisors (1).

665419 is an equidigital number, since it uses as much as digits as its factorization.

665419 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 31.

The square root of 665419 is about 815.7321864436. The cubic root of 665419 is about 87.3035155800.

The spelling of 665419 in words is "six hundred sixty-five thousand, four hundred nineteen".