66471799 has 6 divisors (see below), whose sum is σ = 68843840. Its totient is φ = 64178856.

The previous prime is 66471793. The next prime is 66471803. The reversal of 66471799 is 99717466.

It is not a de Polignac number, because 66471799 - 2¹⁷ = 66340727 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66471793) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 38679 + ... + 40360.

Almost surely, 2^66471799 is an apocalyptic number.

66471799 is a deficient number, since it is larger than the sum of its proper divisors (2372041).

66471799 is an equidigital number, since it uses as much as digits as its factorization.

66471799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79097 (or 79068 counting only the distinct ones).

The product of its digits is 571536, while the sum is 49.

The square root of 66471799 is about 8153.0239175413. The cubic root of 66471799 is about 405.0846726383.

The spelling of 66471799 in words is "sixty-six million, four hundred seventy-one thousand, seven hundred ninety-nine".