81545478210 has 192 divisors, whose sum is σ = 248764538880. Its totient is φ = 18145088640.

The previous prime is 81545478193. The next prime is 81545478233. The reversal of 81545478210 is 1287454518.

81545478210 is a `hidden beast` number, since 8 + 15 + 4 + 547 + 82 + 10 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 8420151 + ... + 8429829.

It is an arithmetic number, because the mean of its divisors is an integer number (1295648640).

Almost surely, 2^81545478210 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81545478210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (124382269440).

81545478210 is an abundant number, since it is smaller than the sum of its proper divisors (167219060670).

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

81545478210 is a wasteful number, since it uses less digits than its factorization.

81545478210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10053 (or 10050 counting only the distinct ones).

The product of its (nonzero) digits is 358400, while the sum is 45.

The spelling of 81545478210 in words is "eighty-one billion, five hundred forty-five million, four hundred seventy-eight thousand, two hundred ten".