1616543440 has 20 divisors (see below), whose sum is σ = 3758463684. Its totient is φ = 646617344.

The previous prime is 1616543437. The next prime is 1616543459. The reversal of 1616543440 is 443456161.

It can be written as a sum of positive squares in 2 ways, for example, as 289544256 + 1326999184 = 17016^2 + 36428^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×1616543440² = 5226425386814067200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1616543396 and 1616543405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10103317 + ... + 10103476.

Almost surely, 2^1616543440 is an apocalyptic number.

1616543440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1616543440 is an abundant number, since it is smaller than the sum of its proper divisors (2141920244).

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

1616543440 is a wasteful number, since it uses less digits than its factorization.

1616543440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20206806 (or 20206800 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 1616543440 is about 40206.2612039468. The cubic root of 1616543440 is about 1173.6243904608.

The spelling of 1616543440 in words is "one billion, six hundred sixteen million, five hundred forty-three thousand, four hundred forty".