1720204274666 has 16 divisors (see below), whose sum is σ = 2613747225600. Its totient is φ = 848961688848.

The previous prime is 1720204274647. The next prime is 1720204274731. The reversal of 1720204274666 is 6664724020271.

It is a self number, because there is not a number n which added to its sum of digits gives 1720204274666.

It is an unprimeable number.

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, 1089905 + ... + 2151348.

It is an arithmetic number, because the mean of its divisors is an integer number (163359201600).

Almost surely, 2^{1720204274666} is an apocalyptic number.

1720204274666 is a deficient number, since it is larger than the sum of its proper divisors (893542950934).

1720204274666 is a wasteful number, since it uses less digits than its factorization.

1720204274666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3244693.

The product of its (nonzero) digits is 1354752, while the sum is 47.

The spelling of 1720204274666 in words is "one trillion, seven hundred twenty billion, two hundred four million, two hundred seventy-four thousand, six hundred sixty-six".