66636406 has 8 divisors (see below), whose sum is σ = 99989280. Its totient is φ = 33306648.

The previous prime is 66636397. The next prime is 66636407. The reversal of 66636406 is 60463666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66636407) 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, 8020 + ... + 14056.

It is an arithmetic number, because the mean of its divisors is an integer number (12498660).

Almost surely, 2^66636406 is an apocalyptic number.

66636406 is a deficient number, since it is larger than the sum of its proper divisors (33352874).

66636406 is a wasteful number, since it uses less digits than its factorization.

66636406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11558.

The product of its (nonzero) digits is 93312, while the sum is 37.

The square root of 66636406 is about 8163.1125191314. The cubic root of 66636406 is about 405.4187732576.

The spelling of 66636406 in words is "sixty-six million, six hundred thirty-six thousand, four hundred six".