66417619 has 2 divisors, whose sum is σ = 66417620. Its totient is φ = 66417618.

The previous prime is 66417613. The next prime is 66417649. The reversal of 66417619 is 91671466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66417619 - 2⁹ = 66417107 is a prime.

It is a super-2 number, since 2×66417619² = 8822600227258322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66417613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33208809 + 33208810.

It is an arithmetic number, because the mean of its divisors is an integer number (33208810).

Almost surely, 2^66417619 is an apocalyptic number.

66417619 is a deficient number, since it is larger than the sum of its proper divisors (1).

66417619 is an equidigital number, since it uses as much as digits as its factorization.

66417619 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 40.

The square root of 66417619 is about 8149.7005466459. The cubic root of 66417619 is about 404.9745835800.

The spelling of 66417619 in words is "sixty-six million, four hundred seventeen thousand, six hundred nineteen".