1720512151171 has 16 divisors (see below), whose sum is σ = 1892653498368. Its totient is φ = 1551005064000.

The previous prime is 1720512151153. The next prime is 1720512151187. The reversal of 1720512151171 is 1711512150271.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1720512151171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1720512157171) 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, 2475246 + ... + 3093196.

It is an arithmetic number, because the mean of its divisors is an integer number (118290843648).

Almost surely, 2^{1720512151171} is an apocalyptic number.

1720512151171 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1720512151171 is a deficient number, since it is larger than the sum of its proper divisors (172141347197).

1720512151171 is a wasteful number, since it uses less digits than its factorization.

1720512151171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 620082.

The product of its (nonzero) digits is 4900, while the sum is 34.

The spelling of 1720512151171 in words is "one trillion, seven hundred twenty billion, five hundred twelve million, one hundred fifty-one thousand, one hundred seventy-one".