3561918403680 has 960 divisors, whose sum is σ = 15787513526400. Its totient is φ = 751513448448.

The previous prime is 3561918403669. The next prime is 3561918403741. The reversal of 3561918403680 is 863048191653.

3561918403680 is a `hidden beast` number, since 3 + 5 + 619 + 18 + 4 + 0 + 3 + 6 + 8 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 57757822 + ... + 57819458.

It is an arithmetic number, because the mean of its divisors is an integer number (16445326590).

Almost surely, 2^{3561918403680} is an apocalyptic number.

3561918403680 is a gapful number since it is divisible by the number (30) 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 3561918403680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7893756763200).

3561918403680 is an abundant number, since it is smaller than the sum of its proper divisors (12225595122720).

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

3561918403680 is a wasteful number, since it uses less digits than its factorization.

3561918403680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61698 (or 61667 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 54.

The spelling of 3561918403680 in words is "three trillion, five hundred sixty-one billion, nine hundred eighteen million, four hundred three thousand, six hundred eighty".