66211619 has 2 divisors, whose sum is σ = 66211620. Its totient is φ = 66211618.

The previous prime is 66211609. The next prime is 66211627. The reversal of 66211619 is 91611266.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66211619 is a prime.

It is a super-2 number, since 2×66211619² = 8767956981202322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66211609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33105809 + 33105810.

It is an arithmetic number, because the mean of its divisors is an integer number (33105810).

Almost surely, 2^66211619 is an apocalyptic number.

66211619 is a deficient number, since it is larger than the sum of its proper divisors (1).

66211619 is an equidigital number, since it uses as much as digits as its factorization.

66211619 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3888, while the sum is 32.

The square root of 66211619 is about 8137.0522303842. The cubic root of 66211619 is about 404.5554620471. Note that the first 3 decimals are identical.

The spelling of 66211619 in words is "sixty-six million, two hundred eleven thousand, six hundred nineteen".