815666462216 has 8 divisors (see below), whose sum is σ = 1529374616670. Its totient is φ = 407833231104.

The previous prime is 815666462173. The next prime is 815666462321. The reversal of 815666462216 is 612264666518.

815666462216 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 640144008100 + 175522454116 = 800090^2 + 418954^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50979153881 + ... + 50979153896.

Almost surely, 2^815666462216 is an apocalyptic number.

It is an amenable number.

815666462216 is a deficient number, since it is larger than the sum of its proper divisors (713708154454).

815666462216 is a wasteful number, since it uses less digits than its factorization.

815666462216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101958307783 (or 101958307779 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 53.

The spelling of 815666462216 in words is "eight hundred fifteen billion, six hundred sixty-six million, four hundred sixty-two thousand, two hundred sixteen".