1720665064810 has 12 divisors (see below), whose sum is σ = 3097204583238. Its totient is φ = 688264366688.

The previous prime is 1720665064721. The next prime is 1720665064817. The reversal of 1720665064810 is 184605660271.

It can be written as a sum of positive squares in 3 ways, for example, as 851535847369 + 869129217441 = 922787^2 + 932271^2 .

It is a super-2 number, since 2×1720665064810² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1720665064817) 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 5 ways as a sum of consecutive naturals, for example, 3940686 + ... + 4355494.

Almost surely, 2^{1720665064810} is an apocalyptic number.

1720665064810 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1720665064810 is a deficient number, since it is larger than the sum of its proper divisors (1376539518428).

1720665064810 is an frugal number, since it uses more digits than its factorization.

1720665064810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 829625 (or 414816 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 46.

The spelling of 1720665064810 in words is "one trillion, seven hundred twenty billion, six hundred sixty-five million, sixty-four thousand, eight hundred ten".