81520083020710 has 16 divisors (see below), whose sum is σ = 146737522998000. Its totient is φ = 32607727972576.

The previous prime is 81520083020699. The next prime is 81520083020741. The reversal of 81520083020710 is 1702038002518.

It is a self number, because there is not a number n which added to its sum of digits gives 81520083020710.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37031185 + ... + 39170764.

It is an arithmetic number, because the mean of its divisors is an integer number (9171095187375).

Almost surely, 2^{81520083020710} is an apocalyptic number.

81520083020710 is a deficient number, since it is larger than the sum of its proper divisors (65217439977290).

81520083020710 is a wasteful number, since it uses less digits than its factorization.

81520083020710 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76308935.

The product of its (nonzero) digits is 26880, while the sum is 37.

The spelling of 81520083020710 in words is "eighty-one trillion, five hundred twenty billion, eighty-three million, twenty thousand, seven hundred ten".