66405588415 has 8 divisors (see below), whose sum is σ = 80508219120. Its totient is φ = 52576795392.

The previous prime is 66405588413. The next prime is 66405588419. The reversal of 66405588415 is 51488550466.

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 66405588415 - 2¹ = 66405588413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66405588413) 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, 68458885 + ... + 68459854.

It is an arithmetic number, because the mean of its divisors is an integer number (10063527390).

Almost surely, 2^66405588415 is an apocalyptic number.

66405588415 is a deficient number, since it is larger than the sum of its proper divisors (14102630705).

66405588415 is a wasteful number, since it uses less digits than its factorization.

66405588415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136918841.

The product of its (nonzero) digits is 4608000, while the sum is 52.

The spelling of 66405588415 in words is "sixty-six billion, four hundred five million, five hundred eighty-eight thousand, four hundred fifteen".