163661140 has 24 divisors (see below), whose sum is σ = 348042240. Its totient is φ = 64635168.

The previous prime is 163661137. The next prime is 163661149. The reversal of 163661140 is 41166361.

It is a junction number, because it is equal to n+sod(n) for n = 163661099 and 163661108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163661149) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 50212 + ... + 53371.

It is an arithmetic number, because the mean of its divisors is an integer number (14501760).

Almost surely, 2^163661140 is an apocalyptic number.

163661140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

163661140 is an abundant number, since it is smaller than the sum of its proper divisors (184381100).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

163661140 is a wasteful number, since it uses less digits than its factorization.

163661140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103671 (or 103669 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 163661140 is about 12793.0113734023. The cubic root of 163661140 is about 546.9931117515.

The spelling of 163661140 in words is "one hundred sixty-three million, six hundred sixty-one thousand, one hundred forty".