66448747 has 4 divisors (see below), whose sum is σ = 66488656. Its totient is φ = 66408840.

The previous prime is 66448727. The next prime is 66448751. The reversal of 66448747 is 74784466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74784466 = 2 ⋅37392233.

It is a cyclic number.

It is not a de Polignac number, because 66448747 - 2⁷ = 66448619 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66448697 and 66448706.

It is not an unprimeable number, because it can be changed into a prime (66448727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17343 + ... + 20824.

It is an arithmetic number, because the mean of its divisors is an integer number (16622164).

Almost surely, 2^66448747 is an apocalyptic number.

66448747 is a deficient number, since it is larger than the sum of its proper divisors (39909).

66448747 is a wasteful number, since it uses less digits than its factorization.

66448747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39908.

The product of its digits is 903168, while the sum is 46.

The square root of 66448747 is about 8151.6100863572. The cubic root of 66448747 is about 405.0378402890.

The spelling of 66448747 in words is "sixty-six million, four hundred forty-eight thousand, seven hundred forty-seven".