8616561783540 has 48 divisors (see below), whose sum is σ = 24535294580160. Its totient is φ = 2258804896000.

The previous prime is 8616561783527. The next prime is 8616561783559. The reversal of 8616561783540 is 453871656168.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1217024961 + ... + 1217032040.

It is an arithmetic number, because the mean of its divisors is an integer number (511151970420).

Almost surely, 2^{8616561783540} is an apocalyptic number.

It is an amenable number.

8616561783540 is an abundant number, since it is smaller than the sum of its proper divisors (15918732796620).

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

8616561783540 is a wasteful number, since it uses less digits than its factorization.

8616561783540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2434057072 (or 2434057070 counting only the distinct ones).

The product of its (nonzero) digits is 29030400, while the sum is 60.

The spelling of 8616561783540 in words is "eight trillion, six hundred sixteen billion, five hundred sixty-one million, seven hundred eighty-three thousand, five hundred forty".