17047545721 has 2 divisors, whose sum is σ = 17047545722. Its totient is φ = 17047545720.

The previous prime is 17047545707. The next prime is 17047545811. The reversal of 17047545721 is 12754574071.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14068569321 + 2978976400 = 118611^2 + 54580^2 .

It is a cyclic number.

It is not a de Polignac number, because 17047545721 - 2⁵ = 17047545689 is a prime.

It is not a weakly prime, because it can be changed into another prime (17047545121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8523772860 + 8523772861.

It is an arithmetic number, because the mean of its divisors is an integer number (8523772861).

Almost surely, 2^17047545721 is an apocalyptic number.

It is an amenable number.

17047545721 is a deficient number, since it is larger than the sum of its proper divisors (1).

17047545721 is an equidigital number, since it uses as much as digits as its factorization.

17047545721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 274400, while the sum is 43.

The spelling of 17047545721 in words is "seventeen billion, forty-seven million, five hundred forty-five thousand, seven hundred twenty-one".