66449459 has 4 divisors (see below), whose sum is σ = 66641304. Its totient is φ = 66257616.

The previous prime is 66449437. The next prime is 66449497. The reversal of 66449459 is 95494466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95494466 = 2 ⋅47747233.

It is a cyclic number.

It is not a de Polignac number, because 66449459 - 2⁸ = 66449203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66449359) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95402 + ... + 96095.

It is an arithmetic number, because the mean of its divisors is an integer number (16660326).

Almost surely, 2^66449459 is an apocalyptic number.

66449459 is a deficient number, since it is larger than the sum of its proper divisors (191845).

66449459 is a wasteful number, since it uses less digits than its factorization.

66449459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191844.

The product of its digits is 933120, while the sum is 47.

The square root of 66449459 is about 8151.6537585940. The cubic root of 66449459 is about 405.0392869474.

The spelling of 66449459 in words is "sixty-six million, four hundred forty-nine thousand, four hundred fifty-nine".