81648084620 has 12 divisors (see below), whose sum is σ = 171460977744. Its totient is φ = 32659233840.

The previous prime is 81648084613. The next prime is 81648084689. The reversal of 81648084620 is 2648084618.

It is a happy number.

It is a super-2 number, since 2×81648084620² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2041202096 + ... + 2041202135.

It is an arithmetic number, because the mean of its divisors is an integer number (14288414812).

Almost surely, 2^81648084620 is an apocalyptic number.

It is an amenable number.

81648084620 is an abundant number, since it is smaller than the sum of its proper divisors (89812893124).

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

81648084620 is a wasteful number, since it uses less digits than its factorization.

81648084620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4082404240 (or 4082404238 counting only the distinct ones).

The product of its (nonzero) digits is 589824, while the sum is 47.

The spelling of 81648084620 in words is "eighty-one billion, six hundred forty-eight million, eighty-four thousand, six hundred twenty".