1720266660647 has 4 divisors (see below), whose sum is σ = 1766760354216. Its totient is φ = 1673772967080.

The previous prime is 1720266660631. The next prime is 1720266660701. The reversal of 1720266660647 is 7460666620271.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1720266660647 - 2⁴ = 1720266660631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1720266660547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23246846729 + ... + 23246846802.

It is an arithmetic number, because the mean of its divisors is an integer number (441690088554).

Almost surely, 2^{1720266660647} is an apocalyptic number.

1720266660647 is a deficient number, since it is larger than the sum of its proper divisors (46493693569).

1720266660647 is an equidigital number, since it uses as much as digits as its factorization.

1720266660647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46493693568.

The product of its (nonzero) digits is 6096384, while the sum is 53.

The spelling of 1720266660647 in words is "one trillion, seven hundred twenty billion, two hundred sixty-six million, six hundred sixty thousand, six hundred forty-seven".