66469439 has 4 divisors (see below), whose sum is σ = 70379424. Its totient is φ = 62559456.

The previous prime is 66469433. The next prime is 66469451. The reversal of 66469439 is 93496466.

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

It is not a de Polignac number, because 66469439 - 2⁴ = 66469423 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66469393 and 66469402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66469433) 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, 1954967 + ... + 1955000.

It is an arithmetic number, because the mean of its divisors is an integer number (17594856).

Almost surely, 2^66469439 is an apocalyptic number.

66469439 is a deficient number, since it is larger than the sum of its proper divisors (3909985).

66469439 is a wasteful number, since it uses less digits than its factorization.

66469439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3909984.

The product of its digits is 839808, while the sum is 47.

The square root of 66469439 is about 8152.8791846807. The cubic root of 66469439 is about 405.0798785695.

The spelling of 66469439 in words is "sixty-six million, four hundred sixty-nine thousand, four hundred thirty-nine".