690666419 has 2 divisors, whose sum is σ = 690666420. Its totient is φ = 690666418.

The previous prime is 690666413. The next prime is 690666467. The reversal of 690666419 is 914666096.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 690666419 - 2²⁰ = 689617843 is a prime.

It is a super-2 number, since 2×690666419² = 954040204668567122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (690666413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345333209 + 345333210.

It is an arithmetic number, because the mean of its divisors is an integer number (345333210).

Almost surely, 2^690666419 is an apocalyptic number.

690666419 is a deficient number, since it is larger than the sum of its proper divisors (1).

690666419 is an equidigital number, since it uses as much as digits as its factorization.

690666419 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 419904, while the sum is 47.

The square root of 690666419 is about 26280.5330805903. The cubic root of 690666419 is about 883.9399861492.

The spelling of 690666419 in words is "six hundred ninety million, six hundred sixty-six thousand, four hundred nineteen".