66412939 has 8 divisors (see below), whose sum is σ = 67141008. Its totient is φ = 65688480.

The previous prime is 66412933. The next prime is 66412967. The reversal of 66412939 is 93921466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66412939 - 2¹³ = 66404747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66412933) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51369 + ... + 52645.

It is an arithmetic number, because the mean of its divisors is an integer number (8392626).

Almost surely, 2^66412939 is an apocalyptic number.

66412939 is a deficient number, since it is larger than the sum of its proper divisors (728069).

66412939 is a wasteful number, since it uses less digits than its factorization.

66412939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1805.

The product of its digits is 69984, while the sum is 40.

The square root of 66412939 is about 8149.4134144735. The cubic root of 66412939 is about 404.9650714174.

The spelling of 66412939 in words is "sixty-six million, four hundred twelve thousand, nine hundred thirty-nine".