1669943680705 has 8 divisors (see below), whose sum is σ = 2004298331112. Its totient is φ = 1335711001728.

The previous prime is 1669943680687. The next prime is 1669943680729. The reversal of 1669943680705 is 5070863499661.

It can be written as a sum of positive squares in 4 ways, for example, as 828704350224 + 841239330481 = 910332^2 + 917191^2 .

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 1669943680705 - 2⁷ = 1669943680577 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30462732 + ... + 30517501.

It is an arithmetic number, because the mean of its divisors is an integer number (250537291389).

Almost surely, 2^{1669943680705} is an apocalyptic number.

It is an amenable number.

1669943680705 is a deficient number, since it is larger than the sum of its proper divisors (334354650407).

1669943680705 is an equidigital number, since it uses as much as digits as its factorization.

1669943680705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60985715.

The product of its (nonzero) digits is 58786560, while the sum is 64.

The spelling of 1669943680705 in words is "one trillion, six hundred sixty-nine billion, nine hundred forty-three million, six hundred eighty thousand, seven hundred five".