66415016406 has 8 divisors (see below), whose sum is σ = 132830032824. Its totient is φ = 22138338800.

The previous prime is 66415016389. The next prime is 66415016413. The reversal of 66415016406 is 60461051466.

It is a happy number.

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

66415016406 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5534584695 + ... + 5534584706.

It is an arithmetic number, because the mean of its divisors is an integer number (16603754103).

Almost surely, 2^66415016406 is an apocalyptic number.

66415016406 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66415016406 is a wasteful number, since it uses less digits than its factorization.

66415016406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11069169406.

The product of its (nonzero) digits is 103680, while the sum is 39.

The spelling of 66415016406 in words is "sixty-six billion, four hundred fifteen million, sixteen thousand, four hundred six".