81770528880384 has 144 divisors (see below), whose sum is σ = 234670397902080. Its totient is φ = 25192460574720.

The previous prime is 81770528880329. The next prime is 81770528880419. The reversal of 81770528880384 is 48308882507718.

81770528880384 is digitally balanced in base 4 and base 5, because in such bases it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×81770528880384³ (a number of 43 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (69) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67740652 + ... + 68937195.

Almost surely, 2^{81770528880384} is an apocalyptic number.

It is an amenable number.

81770528880384 is an abundant number, since it is smaller than the sum of its proper divisors (152899869021696).

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

81770528880384 is a wasteful number, since it uses less digits than its factorization.

81770528880384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136677926 (or 136677912 counting only the distinct ones).

The product of its (nonzero) digits is 192675840, while the sum is 69.

The spelling of 81770528880384 in words is "eighty-one trillion, seven hundred seventy billion, five hundred twenty-eight million, eight hundred eighty thousand, three hundred eighty-four".