163536781 has 16 divisors (see below), whose sum is σ = 177566400. Its totient is φ = 150087168.

The previous prime is 163536773. The next prime is 163536799. The reversal of 163536781 is 187635361.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 163536781 - 2³ = 163536773 is a prime.

It is a super-2 number, since 2×163536781² = 53488557479683922, which contains 22 as substring.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163536701) 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 15 ways as a sum of consecutive naturals, for example, 247830 + ... + 248488.

It is an arithmetic number, because the mean of its divisors is an integer number (11097900).

Almost surely, 2^163536781 is an apocalyptic number.

It is an amenable number.

163536781 is a deficient number, since it is larger than the sum of its proper divisors (14029619).

163536781 is a wasteful number, since it uses less digits than its factorization.

163536781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1068.

The product of its digits is 90720, while the sum is 40.

The square root of 163536781 is about 12788.1500225795. The cubic root of 163536781 is about 546.8545312001.

It can be divided in two parts, 1635 and 36781, that added together give a 4-th power (38416 = 14⁴).

The spelling of 163536781 in words is "one hundred sixty-three million, five hundred thirty-six thousand, seven hundred eighty-one".