3561216540 has 96 divisors (see below), whose sum is σ = 11673897984. Its totient is φ = 794135040.

The previous prime is 3561216521. The next prime is 3561216551. The reversal of 3561216540 is 456121653.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 86184 + ... + 120623.

It is an arithmetic number, because the mean of its divisors is an integer number (121603104).

Almost surely, 2^3561216540 is an apocalyptic number.

3561216540 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3561216540 is an abundant number, since it is smaller than the sum of its proper divisors (8112681444).

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

3561216540 is a wasteful number, since it uses less digits than its factorization.

3561216540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206867 (or 206865 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 3561216540 is about 59675.9293182771. The cubic root of 3561216540 is about 1527.0952534128.

The spelling of 3561216540 in words is "three billion, five hundred sixty-one million, two hundred sixteen thousand, five hundred forty".