65817763780 has 12 divisors (see below), whose sum is σ = 138217303980. Its totient is φ = 26327105504.

The previous prime is 65817763763. The next prime is 65817763793. The reversal of 65817763780 is 8736771856.

It can be written as a sum of positive squares in 2 ways, for example, as 14995471936 + 50822291844 = 122456^2 + 225438^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1645444075 + ... + 1645444114.

It is an arithmetic number, because the mean of its divisors is an integer number (11518108665).

Almost surely, 2^65817763780 is an apocalyptic number.

It is an amenable number.

65817763780 is an abundant number, since it is smaller than the sum of its proper divisors (72399540200).

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

65817763780 is a wasteful number, since it uses less digits than its factorization.

65817763780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3290888198 (or 3290888196 counting only the distinct ones).

The product of its (nonzero) digits is 11854080, while the sum is 58.

The spelling of 65817763780 in words is "sixty-five billion, eight hundred seventeen million, seven hundred sixty-three thousand, seven hundred eighty".