3561643616 has 48 divisors (see below), whose sum is σ = 7463144304. Its totient is φ = 1667334144.

The previous prime is 3561643583. The next prime is 3561643649. The reversal of 3561643616 is 6163461653.

It is an interprime number because it is at equal distance from previous prime (3561643583) and next prime (3561643649).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88031 + ... + 121953.

It is an arithmetic number, because the mean of its divisors is an integer number (155482173).

Almost surely, 2^3561643616 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 3561643616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3731572152).

3561643616 is an abundant number, since it is smaller than the sum of its proper divisors (3901500688).

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

3561643616 is a wasteful number, since it uses less digits than its factorization.

3561643616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34143 (or 34135 counting only the distinct ones).

The product of its digits is 233280, while the sum is 41.

The square root of 3561643616 is about 59679.5075046703. The cubic root of 3561643616 is about 1527.1562961918.

The spelling of 3561643616 in words is "three billion, five hundred sixty-one million, six hundred forty-three thousand, six hundred sixteen".