1666647063265 has 16 divisors (see below), whose sum is σ = 2157577291728. Its totient is φ = 1231210080256.

The previous prime is 1666647063209. The next prime is 1666647063317. The reversal of 1666647063265 is 5623607466661.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 142708661824 + 1523938401441 = 377768^2 + 1234479^2 .

It is not a de Polignac number, because 1666647063265 - 2⁹ = 1666647062753 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 184972972 + ... + 184981981.

It is an arithmetic number, because the mean of its divisors is an integer number (134848580733).

Almost surely, 2^{1666647063265} is an apocalyptic number.

It is an amenable number.

1666647063265 is a deficient number, since it is larger than the sum of its proper divisors (490930228463).

1666647063265 is a wasteful number, since it uses less digits than its factorization.

1666647063265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 369955028.

The product of its (nonzero) digits is 39191040, while the sum is 58.

The spelling of 1666647063265 in words is "one trillion, six hundred sixty-six billion, six hundred forty-seven million, sixty-three thousand, two hundred sixty-five".