81002148818 has 8 divisors (see below), whose sum is σ = 121504891260. Its totient is φ = 40500518400.

The previous prime is 81002148817. The next prime is 81002148823. The reversal of 81002148818 is 81884120018.

It can be written as a sum of positive squares in 2 ways, for example, as 80620219969 + 381928849 = 283937^2 + 19543^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×81002148818² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81002148817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62483 + ... + 407318.

Almost surely, 2^81002148818 is an apocalyptic number.

81002148818 is a deficient number, since it is larger than the sum of its proper divisors (40502742442).

81002148818 is a wasteful number, since it uses less digits than its factorization.

81002148818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 556012.

The product of its (nonzero) digits is 32768, while the sum is 41.

The spelling of 81002148818 in words is "eighty-one billion, two million, one hundred forty-eight thousand, eight hundred eighteen".