17172754721 has 2 divisors, whose sum is σ = 17172754722. Its totient is φ = 17172754720.

The previous prime is 17172754691. The next prime is 17172754733. The reversal of 17172754721 is 12745727171.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14235114721 + 2937640000 = 119311^2 + 54200^2 .

It is an emirp because it is prime and its reverse (12745727171) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 17172754721 - 2²⁶ = 17105645857 is a prime.

It is not a weakly prime, because it can be changed into another prime (17172754741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8586377360 + 8586377361.

It is an arithmetic number, because the mean of its divisors is an integer number (8586377361).

Almost surely, 2^17172754721 is an apocalyptic number.

It is an amenable number.

17172754721 is a deficient number, since it is larger than the sum of its proper divisors (1).

17172754721 is an equidigital number, since it uses as much as digits as its factorization.

17172754721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 192080, while the sum is 44.

The spelling of 17172754721 in words is "seventeen billion, one hundred seventy-two million, seven hundred fifty-four thousand, seven hundred twenty-one".