161164004503 has 4 divisors (see below), whose sum is σ = 170644240080. Its totient is φ = 151683768928.

The previous prime is 161164004483. The next prime is 161164004509. The reversal of 161164004503 is 305400461161.

161164004503 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 305400461161 = 5407 ⋅56482423.

It is a cyclic number.

It is not a de Polignac number, because 161164004503 - 2⁹ = 161164003991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161164004509) 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 3 ways as a sum of consecutive naturals, for example, 4740117763 + ... + 4740117796.

It is an arithmetic number, because the mean of its divisors is an integer number (42661060020).

Almost surely, 2^161164004503 is an apocalyptic number.

161164004503 is a deficient number, since it is larger than the sum of its proper divisors (9480235577).

161164004503 is an equidigital number, since it uses as much as digits as its factorization.

161164004503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9480235576.

The product of its (nonzero) digits is 8640, while the sum is 31.

Adding to 161164004503 its reverse (305400461161), we get a palindrome (466564465664).

The spelling of 161164004503 in words is "one hundred sixty-one billion, one hundred sixty-four million, four thousand, five hundred three".