81520083020706 has 96 divisors (see below), whose sum is σ = 190229144474880. Its totient is φ = 23191369090560.

The previous prime is 81520083020699. The next prime is 81520083020741. The reversal of 81520083020706 is 60702038002518.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3418986 + ... + 13218533.

It is an arithmetic number, because the mean of its divisors is an integer number (1981553588280).

Almost surely, 2^{81520083020706} is an apocalyptic number.

81520083020706 is an abundant number, since it is smaller than the sum of its proper divisors (108709061454174).

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

81520083020706 is a wasteful number, since it uses less digits than its factorization.

81520083020706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16637960 (or 16637949 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 42.

The spelling of 81520083020706 in words is "eighty-one trillion, five hundred twenty billion, eighty-three million, twenty thousand, seven hundred six".