163654749 has 10 divisors (see below), whose sum is σ = 244472030. Its totient is φ = 109103112.

The previous prime is 163654747. The next prime is 163654753. The reversal of 163654749 is 947456361.

163654749 is a `hidden beast` number, since 1 + 63 + 6 + 547 + 49 = 666.

It can be written as a sum of positive squares in only one way, i.e., 116251524 + 47403225 = 10782^2 + 6885^2 .

It is not a de Polignac number, because 163654749 - 2¹ = 163654747 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163654747) by changing a digit.

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

It is an upside-down number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1010134 + ... + 1010295.

It is an arithmetic number, because the mean of its divisors is an integer number (24447203).

Almost surely, 2^163654749 is an apocalyptic number.

It is an amenable number.

163654749 is a deficient number, since it is larger than the sum of its proper divisors (80817281).

163654749 is an equidigital number, since it uses as much as digits as its factorization.

163654749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2020441 (or 2020432 counting only the distinct ones).

The product of its digits is 544320, while the sum is 45.

The square root of 163654749 is about 12792.7615861471. The cubic root of 163654749 is about 546.9859915956.

The spelling of 163654749 in words is "one hundred sixty-three million, six hundred fifty-four thousand, seven hundred forty-nine".