7775668021856 has 96 divisors (see below), whose sum is σ = 17546455664640. Its totient is φ = 3322681399296.

The previous prime is 7775668021813. The next prime is 7775668021949. The reversal of 7775668021856 is 6581208665777.

It is a super-2 number, since 2×7775668021856² (a number of 27 digits) contains 22 as substring.

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, 350354696 + ... + 350376888.

It is an arithmetic number, because the mean of its divisors is an integer number (182775579840).

Almost surely, 2^{7775668021856} 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 7775668021856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8773227832320).

7775668021856 is an abundant number, since it is smaller than the sum of its proper divisors (9770787642784).

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

7775668021856 is a wasteful number, since it uses less digits than its factorization.

7775668021856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26716 (or 26708 counting only the distinct ones).

The product of its (nonzero) digits is 237081600, while the sum is 68.

The spelling of 7775668021856 in words is "seven trillion, seven hundred seventy-five billion, six hundred sixty-eight million, twenty-one thousand, eight hundred fifty-six".