1720834056901 has 2 divisors, whose sum is σ = 1720834056902. Its totient is φ = 1720834056900.

The previous prime is 1720834056749. The next prime is 1720834056913. The reversal of 1720834056901 is 1096504380271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1717150780801 + 3683276100 = 1310401^2 + 60690^2 .

It is a cyclic number.

It is not a de Polignac number, because 1720834056901 - 2²³ = 1720825668293 is a prime.

It is a super-2 number, since 2×1720834056901² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1720834056001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 860417028450 + 860417028451.

It is an arithmetic number, because the mean of its divisors is an integer number (860417028451).

It is a 1-persistent number, because it is pandigital, but 2⋅1720834056901 = 3441668113802 is not.

Almost surely, 2^{1720834056901} is an apocalyptic number.

It is an amenable number.

1720834056901 is a deficient number, since it is larger than the sum of its proper divisors (1).

1720834056901 is an equidigital number, since it uses as much as digits as its factorization.

1720834056901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 362880, while the sum is 46.

The spelling of 1720834056901 in words is "one trillion, seven hundred twenty billion, eight hundred thirty-four million, fifty-six thousand, nine hundred one".