66669619 has 2 divisors, whose sum is σ = 66669620. Its totient is φ = 66669618.

The previous prime is 66669611. The next prime is 66669683. The reversal of 66669619 is 91696666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66669619 - 2³ = 66669611 is a prime.

It is a super-2 number, since 2×66669619² = 8889676195210322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66669611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33334809 + 33334810.

It is an arithmetic number, because the mean of its divisors is an integer number (33334810).

Almost surely, 2^66669619 is an apocalyptic number.

66669619 is a deficient number, since it is larger than the sum of its proper divisors (1).

66669619 is an equidigital number, since it uses as much as digits as its factorization.

66669619 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 629856, while the sum is 49.

The square root of 66669619 is about 8165.1466000311. The cubic root of 66669619 is about 405.4861185124.

The spelling of 66669619 in words is "sixty-six million, six hundred sixty-nine thousand, six hundred nineteen".