17120720001 has 48 divisors (see below), whose sum is σ = 29443704768. Its totient is φ = 8748028800.

The previous prime is 17120719999. The next prime is 17120720027. The reversal of 17120720001 is 10002702171.

It is a happy number.

It is not a de Polignac number, because 17120720001 - 2¹ = 17120719999 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 17120720001.

It is not an unprimeable number, because it can be changed into a prime (17120720041) 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 47 ways as a sum of consecutive naturals, for example, 11851 + ... + 185423.

It is an arithmetic number, because the mean of its divisors is an integer number (613410516).

Almost surely, 2^17120720001 is an apocalyptic number.

17120720001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

17120720001 is a deficient number, since it is larger than the sum of its proper divisors (12322984767).

17120720001 is a wasteful number, since it uses less digits than its factorization.

17120720001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173662 (or 173655 counting only the distinct ones).

The product of its (nonzero) digits is 196, while the sum is 21.

The spelling of 17120720001 in words is "seventeen billion, one hundred twenty million, seven hundred twenty thousand, one".