66120306405 has 16 divisors (see below), whose sum is σ = 105921368064. Its totient is φ = 35221204160.

The previous prime is 66120306397. The next prime is 66120306407. The reversal of 66120306405 is 50460302166.

It is not a de Polignac number, because 66120306405 - 2³ = 66120306397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66120306407) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2672229 + ... + 2696858.

It is an arithmetic number, because the mean of its divisors is an integer number (6620085504).

Almost surely, 2^66120306405 is an apocalyptic number.

It is an amenable number.

66120306405 is a deficient number, since it is larger than the sum of its proper divisors (39801061659).

66120306405 is a wasteful number, since it uses less digits than its factorization.

66120306405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5369916.

The product of its (nonzero) digits is 25920, while the sum is 33.

The spelling of 66120306405 in words is "sixty-six billion, one hundred twenty million, three hundred six thousand, four hundred five".