81548538948 has 18 divisors (see below), whose sum is σ = 206136584654. Its totient is φ = 27182846304.

The previous prime is 81548538937. The next prime is 81548538997. The reversal of 81548538948 is 84983584518.

81548538948 is a `hidden beast` number, since 8 + 1 + 5 + 4 + 8 + 538 + 94 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 81303679044 + 244859904 = 285138^2 + 15648^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1132618561 + ... + 1132618632.

Almost surely, 2^81548538948 is an apocalyptic number.

It is an amenable number.

81548538948 is an abundant number, since it is smaller than the sum of its proper divisors (124588045706).

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

81548538948 is a wasteful number, since it uses less digits than its factorization.

81548538948 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2265237203 (or 2265237198 counting only the distinct ones).

The product of its digits is 44236800, while the sum is 63.

The spelling of 81548538948 in words is "eighty-one billion, five hundred forty-eight million, five hundred thirty-eight thousand, nine hundred forty-eight".