66145619 has 2 divisors, whose sum is σ = 66145620. Its totient is φ = 66145618.

The previous prime is 66145613. The next prime is 66145627. The reversal of 66145619 is 91654166.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66145619 is a prime.

It is a super-2 number, since 2×66145619² = 8750485825786322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66145613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33072809 + 33072810.

It is an arithmetic number, because the mean of its divisors is an integer number (33072810).

Almost surely, 2^66145619 is an apocalyptic number.

66145619 is a deficient number, since it is larger than the sum of its proper divisors (1).

66145619 is an equidigital number, since it uses as much as digits as its factorization.

66145619 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38880, while the sum is 38.

The square root of 66145619 is about 8132.9956965438. The cubic root of 66145619 is about 404.4209965380.

The spelling of 66145619 in words is "sixty-six million, one hundred forty-five thousand, six hundred nineteen".