161768503 has 4 divisors (see below), whose sum is σ = 174212248. Its totient is φ = 149324760.

The previous prime is 161768483. The next prime is 161768507. The reversal of 161768503 is 305867161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 305867161 = 401 ⋅762761.

It is a de Polignac number, because none of the positive numbers 2^k-161768503 is a prime.

It is a super-2 number, since 2×161768503² = 52338097125722018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161768507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6221853 + ... + 6221878.

It is an arithmetic number, because the mean of its divisors is an integer number (43553062).

Almost surely, 2^161768503 is an apocalyptic number.

161768503 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

161768503 is a deficient number, since it is larger than the sum of its proper divisors (12443745).

161768503 is a wasteful number, since it uses less digits than its factorization.

161768503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12443744.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 161768503 is about 12718.8247491661. The cubic root of 161768503 is about 544.8763886536.

The spelling of 161768503 in words is "one hundred sixty-one million, seven hundred sixty-eight thousand, five hundred three".