1616661844 has 12 divisors (see below), whose sum is σ = 3233323744. Its totient is φ = 692855064.

The previous prime is 1616661821. The next prime is 1616661887. The reversal of 1616661844 is 4481666161.

1616661844 is an admirable number.

It is a super-2 number, since 2×1616661844² = 5227191035690960672, 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 1616661844.

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 3 ways as a sum of consecutive naturals, for example, 28868934 + ... + 28868989.

Almost surely, 2^1616661844 is an apocalyptic number.

1616661844 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1616661844 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1616661844 is a wasteful number, since it uses less digits than its factorization.

1616661844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57737934 (or 57737932 counting only the distinct ones).

The product of its digits is 165888, while the sum is 43.

The square root of 1616661844 is about 40207.7336342152. The cubic root of 1616661844 is about 1173.6530438675.

The spelling of 1616661844 in words is "one billion, six hundred sixteen million, six hundred sixty-one thousand, eight hundred forty-four".