7700921957820 has 768 divisors, whose sum is σ = 27273840168960. Its totient is φ = 1580492390400.

The previous prime is 7700921957789. The next prime is 7700921957821. The reversal of 7700921957820 is 287591290077.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7700921957821) by changing a digit.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 21815642764 + ... + 21815643116.

It is an arithmetic number, because the mean of its divisors is an integer number (35512812720).

Almost surely, 2^{7700921957820} is an apocalyptic number.

7700921957820 is a gapful number since it is divisible by the number (70) 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 7700921957820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13636920084480).

7700921957820 is an abundant number, since it is smaller than the sum of its proper divisors (19572918211140).

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

7700921957820 is a wasteful number, since it uses less digits than its factorization.

7700921957820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 966 (or 964 counting only the distinct ones).

The product of its (nonzero) digits is 4445280, while the sum is 57.

The spelling of 7700921957820 in words is "seven trillion, seven hundred billion, nine hundred twenty-one million, nine hundred fifty-seven thousand, eight hundred twenty".