666773313752505 has 32 divisors (see below), whose sum is σ = 1103627039074560. Its totient is φ = 343349238176000.

The previous prime is 666773313752503. The next prime is 666773313752509. The reversal of 666773313752505 is 505257313377666.

It is a happy number.

It is not a de Polignac number, because 666773313752505 - 2¹ = 666773313752503 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (666773313752503) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 264977755 + ... + 267482255.

It is an arithmetic number, because the mean of its divisors is an integer number (34488344971080).

Almost surely, 2^{666773313752505} is an apocalyptic number.

It is an amenable number.

666773313752505 is a deficient number, since it is larger than the sum of its proper divisors (436853725322055).

666773313752505 is a wasteful number, since it uses less digits than its factorization.

666773313752505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3116561.

The product of its (nonzero) digits is 500094000, while the sum is 66.

The spelling of 666773313752505 in words is "six hundred sixty-six trillion, seven hundred seventy-three billion, three hundred thirteen million, seven hundred fifty-two thousand, five hundred five".