1646556444 has 96 divisors (see below), whose sum is σ = 4745646080. Its totient is φ = 490276800.

The previous prime is 1646556427. The next prime is 1646556479. The reversal of 1646556444 is 4446556461.

1646556444 is a `hidden beast` number, since 1 + 6 + 46 + 5 + 564 + 44 = 666.

It is a super-2 number, since 2×1646556444² = 5422296246555850272, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1646556444.

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 31 ways as a sum of consecutive naturals, for example, 24609 + ... + 62439.

Almost surely, 2^1646556444 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1646556444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2372823040).

1646556444 is an abundant number, since it is smaller than the sum of its proper divisors (3099089636).

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

1646556444 is a wasteful number, since it uses less digits than its factorization.

1646556444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37888 (or 37880 counting only the distinct ones).

The product of its digits is 1382400, while the sum is 45.

The square root of 1646556444 is about 40577.7826402577. The cubic root of 1646556444 is about 1180.8431310258.

The spelling of 1646556444 in words is "one billion, six hundred forty-six million, five hundred fifty-six thousand, four hundred forty-four".