66439353 has 4 divisors (see below), whose sum is σ = 88585808. Its totient is φ = 44292900.

The previous prime is 66439339. The next prime is 66439357. The reversal of 66439353 is 35393466.

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 66439353 - 2⁴ = 66439337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66439357) 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, 11073223 + ... + 11073228.

It is an arithmetic number, because the mean of its divisors is an integer number (22146452).

Almost surely, 2^66439353 is an apocalyptic number.

It is an amenable number.

66439353 is a deficient number, since it is larger than the sum of its proper divisors (22146455).

66439353 is a wasteful number, since it uses less digits than its factorization.

66439353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22146454.

The product of its digits is 174960, while the sum is 39.

The square root of 66439353 is about 8151.0338608056. The cubic root of 66439353 is about 405.0187523705.

The spelling of 66439353 in words is "sixty-six million, four hundred thirty-nine thousand, three hundred fifty-three".