1720661260166 has 16 divisors (see below), whose sum is σ = 2609610921456. Its totient is φ = 850804632576.

The previous prime is 1720661260163. The next prime is 1720661260229. The reversal of 1720661260166 is 6610621660271.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1720661260163) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3167576 + ... + 3670811.

It is an arithmetic number, because the mean of its divisors is an integer number (163100682591).

Almost surely, 2^{1720661260166} is an apocalyptic number.

1720661260166 is a deficient number, since it is larger than the sum of its proper divisors (888949661290).

1720661260166 is a wasteful number, since it uses less digits than its factorization.

1720661260166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6839783.

The product of its (nonzero) digits is 217728, while the sum is 44.

The spelling of 1720661260166 in words is "one trillion, seven hundred twenty billion, six hundred sixty-one million, two hundred sixty thousand, one hundred sixty-six".