1215772685568 has 576 divisors, whose sum is σ = 4294197411840. Its totient is φ = 336124753920.

The previous prime is 1215772685497. The next prime is 1215772685591. The reversal of 1215772685568 is 8655862775121.

It is a happy number.

1215772685568 is a `hidden beast` number, since 1 + 2 + 1 + 5 + 7 + 7 + 2 + 68 + 5 + 568 = 666.

It is a tau number, because it is divible by the number of its divisors (576).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 121487221 + ... + 121497227.

It is an arithmetic number, because the mean of its divisors is an integer number (7455203840).

Almost surely, 2^{1215772685568} is an apocalyptic number.

1215772685568 is a gapful number since it is divisible by the number (18) 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 1215772685568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2147098705920).

1215772685568 is an abundant number, since it is smaller than the sum of its proper divisors (3078424726272).

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

1215772685568 is an frugal number, since it uses more digits than its factorization.

1215772685568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10082 (or 10050 counting only the distinct ones).

The product of its digits is 56448000, while the sum is 63.

The spelling of 1215772685568 in words is "one trillion, two hundred fifteen billion, seven hundred seventy-two million, six hundred eighty-five thousand, five hundred sixty-eight".