6561501051516 has 24 divisors (see below), whose sum is σ = 15320091502464. Its totient is φ = 2185749534000.

The previous prime is 6561501051491. The next prime is 6561501051517. The reversal of 6561501051516 is 6151501051656.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6561501051517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 177166110 + ... + 177203141.

It is an arithmetic number, because the mean of its divisors is an integer number (638337145936).

Almost surely, 2^{6561501051516} is an apocalyptic number.

It is an amenable number.

6561501051516 is an abundant number, since it is smaller than the sum of its proper divisors (8758590450948).

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

6561501051516 is a wasteful number, since it uses less digits than its factorization.

6561501051516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354370801 (or 354370799 counting only the distinct ones).

The product of its (nonzero) digits is 135000, while the sum is 42.

The spelling of 6561501051516 in words is "six trillion, five hundred sixty-one billion, five hundred one million, fifty-one thousand, five hundred sixteen".