65781897318 has 48 divisors (see below), whose sum is σ = 150050674800. Its totient is φ = 20770214400.

The previous prime is 65781897317. The next prime is 65781897319. The reversal of 65781897318 is 81379818756.

It is an interprime number because it is at equal distance from previous prime (65781897317) and next prime (65781897319).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65781897317) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4208718 + ... + 4224318.

It is an arithmetic number, because the mean of its divisors is an integer number (3126055725).

Almost surely, 2^65781897318 is an apocalyptic number.

65781897318 is an abundant number, since it is smaller than the sum of its proper divisors (84268777482).

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

65781897318 is a wasteful number, since it uses less digits than its factorization.

65781897318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27957 (or 27954 counting only the distinct ones).

The product of its digits is 20321280, while the sum is 63.

The spelling of 65781897318 in words is "sixty-five billion, seven hundred eighty-one million, eight hundred ninety-seven thousand, three hundred eighteen".