666056146505 has 8 divisors (see below), whose sum is σ = 811196740032. Its totient is φ = 524892007728.

The previous prime is 666056146471. The next prime is 666056146507. The reversal of 666056146505 is 505641650666.

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 666056146505 - 2¹⁶ = 666056080969 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (666056146507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 994113317 + ... + 994113986.

It is an arithmetic number, because the mean of its divisors is an integer number (101399592504).

Almost surely, 2^666056146505 is an apocalyptic number.

It is an amenable number.

666056146505 is a deficient number, since it is larger than the sum of its proper divisors (145140593527).

666056146505 is a wasteful number, since it uses less digits than its factorization.

666056146505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1988227375.

The product of its (nonzero) digits is 3888000, while the sum is 50.

The spelling of 666056146505 in words is "six hundred sixty-six billion, fifty-six million, one hundred forty-six thousand, five hundred five".