66412405 has 8 divisors (see below), whose sum is σ = 79750872. Its totient is φ = 53092608.

The previous prime is 66412397. The next prime is 66412433. The reversal of 66412405 is 50421466.

It can be written as a sum of positive squares in 4 ways, for example, as 7322436 + 59089969 = 2706^2 + 7687^2 .

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 66412405 - 2³ = 66412397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 4977 + ... + 12553.

It is an arithmetic number, because the mean of its divisors is an integer number (9968859).

Almost surely, 2^66412405 is an apocalyptic number.

It is an amenable number.

66412405 is a deficient number, since it is larger than the sum of its proper divisors (13338467).

66412405 is a wasteful number, since it uses less digits than its factorization.

66412405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9335.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 66412405 is about 8149.3806513133. The cubic root of 66412405 is about 404.9639860269.

The spelling of 66412405 in words is "sixty-six million, four hundred twelve thousand, four hundred five".