16506105725 has 6 divisors (see below), whose sum is σ = 20467571130. Its totient is φ = 13204884560.

The previous prime is 16506105691. The next prime is 16506105727. The reversal of 16506105725 is 52750160561.

It can be written as a sum of positive squares in 3 ways, for example, as 289102009 + 16217003716 = 17003^2 + 127346^2 .

It is not a de Polignac number, because 16506105725 - 2¹⁶ = 16506040189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16506105727) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 330122090 + ... + 330122139.

It is an arithmetic number, because the mean of its divisors is an integer number (3411261855).

Almost surely, 2^16506105725 is an apocalyptic number.

It is an amenable number.

16506105725 is a deficient number, since it is larger than the sum of its proper divisors (3961465405).

16506105725 is an equidigital number, since it uses as much as digits as its factorization.

16506105725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660244239 (or 660244234 counting only the distinct ones).

The product of its (nonzero) digits is 63000, while the sum is 38.

The spelling of 16506105725 in words is "sixteen billion, five hundred six million, one hundred five thousand, seven hundred twenty-five".