66098719 has 2 divisors, whose sum is σ = 66098720. Its totient is φ = 66098718.

The previous prime is 66098717. The next prime is 66098723. The reversal of 66098719 is 91789066.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66098719 - 2¹ = 66098717 is a prime.

It is a super-2 number, since 2×66098719² = 8738081306881922, which contains 22 as substring.

Together with 66098717, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66098717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33049359 + 33049360.

It is an arithmetic number, because the mean of its divisors is an integer number (33049360).

Almost surely, 2^66098719 is an apocalyptic number.

66098719 is a deficient number, since it is larger than the sum of its proper divisors (1).

66098719 is an equidigital number, since it uses as much as digits as its factorization.

66098719 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 66098719 is about 8130.1118688490. Note that the first 3 decimals coincide. The cubic root of 66098719 is about 404.3253901588.

The spelling of 66098719 in words is "sixty-six million, ninety-eight thousand, seven hundred nineteen".