6522643780 has 12 divisors (see below), whose sum is σ = 13697551980. Its totient is φ = 2609057504.

The previous prime is 6522643763. The next prime is 6522643783. The reversal of 6522643780 is 873462256.

It can be written as a sum of positive squares in 2 ways, for example, as 2451438144 + 4071205636 = 49512^2 + 63806^2 .

It is not an unprimeable number, because it can be changed into a prime (6522643783) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 163066075 + ... + 163066114.

It is an arithmetic number, because the mean of its divisors is an integer number (1141462665).

Almost surely, 2^6522643780 is an apocalyptic number.

It is an amenable number.

6522643780 is an abundant number, since it is smaller than the sum of its proper divisors (7174908200).

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

6522643780 is a wasteful number, since it uses less digits than its factorization.

6522643780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326132198 (or 326132196 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 43.

The square root of 6522643780 is about 80762.8861544707. The cubic root of 6522643780 is about 1868.4201990971.

The spelling of 6522643780 in words is "six billion, five hundred twenty-two million, six hundred forty-three thousand, seven hundred eighty".