16725016409 has 2 divisors, whose sum is σ = 16725016410. Its totient is φ = 16725016408.

The previous prime is 16725016403. The next prime is 16725016487. The reversal of 16725016409 is 90461052761.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15393861184 + 1331155225 = 124072^2 + 36485^2 .

It is a cyclic number.

It is not a de Polignac number, because 16725016409 - 2⁸ = 16725016153 is a prime.

It is not a weakly prime, because it can be changed into another prime (16725016403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8362508204 + 8362508205.

It is an arithmetic number, because the mean of its divisors is an integer number (8362508205).

Almost surely, 2^16725016409 is an apocalyptic number.

It is an amenable number.

16725016409 is a deficient number, since it is larger than the sum of its proper divisors (1).

16725016409 is an equidigital number, since it uses as much as digits as its factorization.

16725016409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 41.

The spelling of 16725016409 in words is "sixteen billion, seven hundred twenty-five million, sixteen thousand, four hundred nine".