81641062848 has 28 divisors (see below), whose sum is σ = 216008645960. Its totient is φ = 27213687552.

The previous prime is 81641062823. The next prime is 81641062849. The reversal of 81641062848 is 84826014618.

It is a happy number.

It is a super-2 number, since 2×81641062848² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a junction number, because it is equal to n+sod(n) for n = 81641062797 and 81641062806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81641062849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 212606743 + ... + 212607126.

Almost surely, 2^81641062848 is an apocalyptic number.

It is an amenable number.

81641062848 is an abundant number, since it is smaller than the sum of its proper divisors (134367583112).

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

81641062848 is a wasteful number, since it uses less digits than its factorization.

81641062848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425213884 (or 425213874 counting only the distinct ones).

The product of its (nonzero) digits is 589824, while the sum is 48.

The spelling of 81641062848 in words is "eighty-one billion, six hundred forty-one million, sixty-two thousand, eight hundred forty-eight".