815522855688 has 36 divisors (see below), whose sum is σ = 2208728487615. Its totient is φ = 271838397648.

The previous prime is 815522855681. The next prime is 815522855711. The reversal of 815522855688 is 886558225518.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

815522855688 is a `hidden beast` number, since 8 + 1 + 5 + 52 + 28 + 556 + 8 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 407761427844 + 407761427844 = 638562^2 + 638562^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=638562.

It is not an unprimeable number, because it can be changed into a prime (815522855681) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 7609531 + ... + 7715957.

Almost surely, 2^815522855688 is an apocalyptic number.

It is an amenable number.

815522855688 is an abundant number, since it is smaller than the sum of its proper divisors (1393205631927).

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

815522855688 is an frugal number, since it uses more digits than its factorization.

815522855688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212866 (or 106432 counting only the distinct ones).

The product of its digits is 61440000, while the sum is 63.

The spelling of 815522855688 in words is "eight hundred fifteen billion, five hundred twenty-two million, eight hundred fifty-five thousand, six hundred eighty-eight".