81005851300 has 36 divisors (see below), whose sum is σ = 191762945136. Its totient is φ = 29456672800.

The previous prime is 81005851291. The next prime is 81005851313. The reversal of 81005851300 is 315850018.

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 11 ways as a sum of consecutive naturals, for example, 36819742 + ... + 36821941.

It is an arithmetic number, because the mean of its divisors is an integer number (5326748476).

Almost surely, 2^81005851300 is an apocalyptic number.

It is an amenable number.

81005851300 is an abundant number, since it is smaller than the sum of its proper divisors (110757093836).

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

81005851300 is a wasteful number, since it uses less digits than its factorization.

81005851300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73641708 (or 73641701 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 31.

The spelling of 81005851300 in words is "eighty-one billion, five million, eight hundred fifty-one thousand, three hundred".