66439353441 has 4 divisors (see below), whose sum is σ = 88585804592. Its totient is φ = 44292902292.

The previous prime is 66439353439. The next prime is 66439353521. The reversal of 66439353441 is 14435393466.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 66439353441 - 2¹ = 66439353439 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66439357441) 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, 11073225571 + ... + 11073225576.

It is an arithmetic number, because the mean of its divisors is an integer number (22146451148).

Almost surely, 2^66439353441 is an apocalyptic number.

It is an amenable number.

66439353441 is a deficient number, since it is larger than the sum of its proper divisors (22146451151).

66439353441 is a wasteful number, since it uses less digits than its factorization.

66439353441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22146451150.

The product of its digits is 2799360, while the sum is 48.

The spelling of 66439353441 in words is "sixty-six billion, four hundred thirty-nine million, three hundred fifty-three thousand, four hundred forty-one".