163061640 has 128 divisors (see below), whose sum is σ = 621216000. Its totient is φ = 37269504.

The previous prime is 163061621. The next prime is 163061677. The reversal of 163061640 is 46160361.

163061640 is a `hidden beast` number, since 1 + 6 + 3 + 0 + 616 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 3225 + ... + 18344.

It is an arithmetic number, because the mean of its divisors is an integer number (4853250).

Almost surely, 2^163061640 is an apocalyptic number.

163061640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 163061640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (310608000).

163061640 is an abundant number, since it is smaller than the sum of its proper divisors (458154360).

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

163061640 is a wasteful number, since it uses less digits than its factorization.

163061640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21596 (or 21586 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 163061640 is about 12769.5591153336. The cubic root of 163061640 is about 546.3244056947.

The spelling of 163061640 in words is "one hundred sixty-three million, sixty-one thousand, six hundred forty".