66959447 has 4 divisors (see below), whose sum is σ = 70898256. Its totient is φ = 63020640.

The previous prime is 66959429. The next prime is 66959449. The reversal of 66959447 is 74495966.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66959447 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66959395 and 66959404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66959449) 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, 1969379 + ... + 1969412.

It is an arithmetic number, because the mean of its divisors is an integer number (17724564).

Almost surely, 2^66959447 is an apocalyptic number.

66959447 is a deficient number, since it is larger than the sum of its proper divisors (3938809).

66959447 is a wasteful number, since it uses less digits than its factorization.

66959447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3938808.

The product of its digits is 1632960, while the sum is 50.

The square root of 66959447 is about 8182.8752281823. The cubic root of 66959447 is about 406.0728492475.

The spelling of 66959447 in words is "sixty-six million, nine hundred fifty-nine thousand, four hundred forty-seven".