66425539 has 4 divisors (see below), whose sum is σ = 69921640. Its totient is φ = 62929440.

The previous prime is 66425537. The next prime is 66425551. The reversal of 66425539 is 93552466.

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

It is a cyclic number.

It is not a de Polignac number, because 66425539 - 2¹ = 66425537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66425531) 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, 1748022 + ... + 1748059.

It is an arithmetic number, because the mean of its divisors is an integer number (17480410).

Almost surely, 2^66425539 is an apocalyptic number.

66425539 is a deficient number, since it is larger than the sum of its proper divisors (3496101).

66425539 is a wasteful number, since it uses less digits than its factorization.

66425539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3496100.

The product of its digits is 194400, while the sum is 40.

The square root of 66425539 is about 8150.1864395853. The cubic root of 66425539 is about 404.9906800680.

The spelling of 66425539 in words is "sixty-six million, four hundred twenty-five thousand, five hundred thirty-nine".