81220018248530 has 16 divisors (see below), whose sum is σ = 167081180397120. Its totient is φ = 27846863399472.

The previous prime is 81220018248521. The next prime is 81220018248599. The reversal of 81220018248530 is 3584281002218.

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, 580142987420 + ... + 580142987559.

It is an arithmetic number, because the mean of its divisors is an integer number (10442573774820).

Almost surely, 2^{81220018248530} is an apocalyptic number.

81220018248530 is an abundant number, since it is smaller than the sum of its proper divisors (85861162148590).

81220018248530 is a wasteful number, since it uses less digits than its factorization.

81220018248530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1160285974993.

The product of its (nonzero) digits is 245760, while the sum is 44.

The spelling of 81220018248530 in words is "eighty-one trillion, two hundred twenty billion, eighteen million, two hundred forty-eight thousand, five hundred thirty".