1720665064811 has 16 divisors (see below), whose sum is σ = 2238516269568. Its totient is φ = 1282483276800.

The previous prime is 1720665064721. The next prime is 1720665064817. The reversal of 1720665064811 is 1184605660271.

It is not a de Polignac number, because 1720665064811 - 2¹⁰ = 1720665063787 is a prime.

It is a super-2 number, since 2×1720665064811² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1720665064817) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 485787350 + ... + 485790891.

It is an arithmetic number, because the mean of its divisors is an integer number (139907266848).

Almost surely, 2^{1720665064811} is an apocalyptic number.

1720665064811 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1720665064811 is a deficient number, since it is larger than the sum of its proper divisors (517851204757).

1720665064811 is a wasteful number, since it uses less digits than its factorization.

1720665064811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 971578282.

The product of its (nonzero) digits is 483840, while the sum is 47.

The spelling of 1720665064811 in words is "one trillion, seven hundred twenty billion, six hundred sixty-five million, sixty-four thousand, eight hundred eleven".