666027543377665 has 16 divisors (see below), whose sum is σ = 913507302804480. Its totient is φ = 456655550944320.

The previous prime is 666027543377653. The next prime is 666027543377731. The reversal of 666027543377665 is 566773345720666.

It is not a de Polignac number, because 666027543377665 - 2⁵ = 666027543377633 is a prime.

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, 1021549230 + ... + 1022200999.

It is an arithmetic number, because the mean of its divisors is an integer number (57094206425280).

Almost surely, 2^{666027543377665} is an apocalyptic number.

It is an amenable number.

666027543377665 is a deficient number, since it is larger than the sum of its proper divisors (247479759426815).

666027543377665 is a wasteful number, since it uses less digits than its factorization.

666027543377665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2043759552.

The product of its (nonzero) digits is 4800902400, while the sum is 73.

The spelling of 666027543377665 in words is "six hundred sixty-six trillion, twenty-seven billion, five hundred forty-three million, three hundred seventy-seven thousand, six hundred sixty-five".