1720660755121 has 32 divisors (see below), whose sum is σ = 2204257612032. Its totient is φ = 1303922396160.

The previous prime is 1720660755113. The next prime is 1720660755127. The reversal of 1720660755121 is 1215570660271.

It is a cyclic number.

It is not a de Polignac number, because 1720660755121 - 2³ = 1720660755113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1720660755127) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5947005 + ... + 6229621.

It is an arithmetic number, because the mean of its divisors is an integer number (68883050376).

Almost surely, 2^{1720660755121} is an apocalyptic number.

1720660755121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1720660755121 is a deficient number, since it is larger than the sum of its proper divisors (483596856911).

1720660755121 is a wasteful number, since it uses less digits than its factorization.

1720660755121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284809.

The product of its (nonzero) digits is 176400, while the sum is 43.

The spelling of 1720660755121 in words is "one trillion, seven hundred twenty billion, six hundred sixty million, seven hundred fifty-five thousand, one hundred twenty-one".