65783945820 has 24 divisors (see below), whose sum is σ = 184195048464. Its totient is φ = 17542385536.

The previous prime is 65783945809. The next prime is 65783945827. The reversal of 65783945820 is 2854938756.

65783945820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65783945827) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 548199489 + ... + 548199608.

It is an arithmetic number, because the mean of its divisors is an integer number (7674793686).

Almost surely, 2^65783945820 is an apocalyptic number.

65783945820 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

65783945820 is an abundant number, since it is smaller than the sum of its proper divisors (118411102644).

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

65783945820 is a wasteful number, since it uses less digits than its factorization.

65783945820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1096399109 (or 1096399107 counting only the distinct ones).

The product of its (nonzero) digits is 14515200, while the sum is 57.

The spelling of 65783945820 in words is "sixty-five billion, seven hundred eighty-three million, nine hundred forty-five thousand, eight hundred twenty".