7766421700872 has 128 divisors (see below), whose sum is σ = 20545816320000. Its totient is φ = 2439616734720.

The previous prime is 7766421700867. The next prime is 7766421700901. The reversal of 7766421700872 is 2780071246677.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 478484997 + ... + 478501227.

It is an arithmetic number, because the mean of its divisors is an integer number (160514190000).

Almost surely, 2^{7766421700872} 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 7766421700872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10272908160000).

7766421700872 is an abundant number, since it is smaller than the sum of its proper divisors (12779394619128).

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

7766421700872 is a wasteful number, since it uses less digits than its factorization.

7766421700872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21731 (or 21727 counting only the distinct ones).

The product of its (nonzero) digits is 11063808, while the sum is 57.

The spelling of 7766421700872 in words is "seven trillion, seven hundred sixty-six billion, four hundred twenty-one million, seven hundred thousand, eight hundred seventy-two".