161103428725 has 6 divisors (see below), whose sum is σ = 199768251650. Its totient is φ = 128882742960.

The previous prime is 161103428719. The next prime is 161103428737. The reversal of 161103428725 is 527824301161.

It can be written as a sum of positive squares in 3 ways, for example, as 40870449 + 161062558276 = 6393^2 + 401326^2 .

It is not a de Polignac number, because 161103428725 - 2⁵ = 161103428693 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3222068550 + ... + 3222068599.

Almost surely, 2^161103428725 is an apocalyptic number.

It is an amenable number.

161103428725 is a deficient number, since it is larger than the sum of its proper divisors (38664822925).

161103428725 is an equidigital number, since it uses as much as digits as its factorization.

161103428725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6444137159 (or 6444137154 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 40.

Adding to 161103428725 its reverse (527824301161), we get a palindrome (688927729886).

The spelling of 161103428725 in words is "one hundred sixty-one billion, one hundred three million, four hundred twenty-eight thousand, seven hundred twenty-five".