3561381232640 has 544 divisors, whose sum is σ = 10726598983680. Its totient is φ = 1102734950400.

The previous prime is 3561381232637. The next prime is 3561381232649. The reversal of 3561381232640 is 462321831653.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 3561381232591 and 3561381232600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3561381232649) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4819189391 + ... + 4819190129.

Almost surely, 2^{3561381232640} 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 3561381232640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5363299491840).

3561381232640 is an abundant number, since it is smaller than the sum of its proper divisors (7165217751040).

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

3561381232640 is an equidigital number, since it uses as much as digits as its factorization.

3561381232640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 985 (or 955 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 44.

The spelling of 3561381232640 in words is "three trillion, five hundred sixty-one billion, three hundred eighty-one million, two hundred thirty-two thousand, six hundred forty".