81030544560 has 160 divisors (see below), whose sum is σ = 318977441280. Its totient is φ = 18521263872.

The previous prime is 81030544549. The next prime is 81030544579. The reversal of 81030544560 is 6544503018.

It is a happy number.

81030544560 is a `hidden beast` number, since 8 + 10 + 30 + 54 + 4 + 560 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2664462 + ... + 2694701.

It is an arithmetic number, because the mean of its divisors is an integer number (1993609008).

Almost surely, 2^81030544560 is an apocalyptic number.

81030544560 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81030544560 is an abundant number, since it is smaller than the sum of its proper divisors (237946896720).

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

81030544560 is a wasteful number, since it uses less digits than its factorization.

81030544560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5359192 (or 5359180 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The spelling of 81030544560 in words is "eighty-one billion, thirty million, five hundred forty-four thousand, five hundred sixty".