65815582216 has 8 divisors (see below), whose sum is σ = 123404216670. Its totient is φ = 32907791104.

The previous prime is 65815582211. The next prime is 65815582249. The reversal of 65815582216 is 61228551856.

It can be written as a sum of positive squares in only one way, i.e., 58493357316 + 7322224900 = 241854^2 + 85570^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 65815582216.

It is not an unprimeable number, because it can be changed into a prime (65815582211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4113473881 + ... + 4113473896.

Almost surely, 2^65815582216 is an apocalyptic number.

It is an amenable number.

65815582216 is a deficient number, since it is larger than the sum of its proper divisors (57588634454).

65815582216 is a wasteful number, since it uses less digits than its factorization.

65815582216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8226947783 (or 8226947779 counting only the distinct ones).

The product of its digits is 1152000, while the sum is 49.

The spelling of 65815582216 in words is "sixty-five billion, eight hundred fifteen million, five hundred eighty-two thousand, two hundred sixteen".