163742505 has 16 divisors (see below), whose sum is σ = 262180800. Its totient is φ = 87265088.

The previous prime is 163742489. The next prime is 163742531. The reversal of 163742505 is 505247361.

It is a cyclic number.

It is not a de Polignac number, because 163742505 - 2⁴ = 163742489 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22846 + ... + 29144.

It is an arithmetic number, because the mean of its divisors is an integer number (16386300).

Almost surely, 2^163742505 is an apocalyptic number.

163742505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

163742505 is a deficient number, since it is larger than the sum of its proper divisors (98438295).

163742505 is a wasteful number, since it uses less digits than its factorization.

163742505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8040.

The product of its (nonzero) digits is 25200, while the sum is 33.

The square root of 163742505 is about 12796.1910348353. The cubic root of 163742505 is about 547.0837435718.

Adding to 163742505 its reverse (505247361), we get a palindrome (668989866).

The spelling of 163742505 in words is "one hundred sixty-three million, seven hundred forty-two thousand, five hundred five".