1646161056 has 120 divisors (see below), whose sum is σ = 4914090720. Its totient is φ = 540473472.

The previous prime is 1646161031. The next prime is 1646161063. The reversal of 1646161056 is 6501616461.

It is a happy number.

1646161056 is a `hidden beast` number, since 1 + 646 + 1 + 6 + 1 + 0 + 5 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 1646161056.

It is a congruent number.

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 19 ways as a sum of consecutive naturals, for example, 168925 + ... + 178403.

It is an arithmetic number, because the mean of its divisors is an integer number (40950756).

Almost surely, 2^1646161056 is an apocalyptic number.

1646161056 is a gapful number since it is divisible by the number (16) 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 1646161056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2457045360).

1646161056 is an abundant number, since it is smaller than the sum of its proper divisors (3267929664).

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

1646161056 is an equidigital number, since it uses as much as digits as its factorization.

1646161056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9568 (or 9551 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 1646161056 is about 40572.9103713303. The cubic root of 1646161056 is about 1180.7486047430.

The spelling of 1646161056 in words is "one billion, six hundred forty-six million, one hundred sixty-one thousand, fifty-six".