161253804103 has 18 divisors (see below), whose sum is σ = 192680246024. Its totient is φ = 132188053272.

The previous prime is 161253804073. The next prime is 161253804109. The reversal of 161253804103 is 301408352161.

161253804103 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-161253804103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161253804109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 24432798 + ... + 24439396.

Almost surely, 2^161253804103 is an apocalyptic number.

161253804103 is a deficient number, since it is larger than the sum of its proper divisors (31426441921).

161253804103 is an frugal number, since it uses more digits than its factorization.

161253804103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13251 (or 6629 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 34.

The spelling of 161253804103 in words is "one hundred sixty-one billion, two hundred fifty-three million, eight hundred four thousand, one hundred three".