161503723403 has 8 divisors (see below), whose sum is σ = 179074173936. Its totient is φ = 144414655200.

The previous prime is 161503723393. The next prime is 161503723439. The reversal of 161503723403 is 304327305161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161503723403 - 2⁴ = 161503723387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161503723453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120344876 + ... + 120346217.

It is an arithmetic number, because the mean of its divisors is an integer number (22384271742).

Almost surely, 2^161503723403 is an apocalyptic number.

161503723403 is a deficient number, since it is larger than the sum of its proper divisors (17570450533).

161503723403 is a wasteful number, since it uses less digits than its factorization.

161503723403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240691165.

The product of its (nonzero) digits is 45360, while the sum is 35.

The spelling of 161503723403 in words is "one hundred sixty-one billion, five hundred three million, seven hundred twenty-three thousand, four hundred three".