81200051286 has 16 divisors (see below), whose sum is σ = 162445045104. Its totient is φ = 27059193344.

The previous prime is 81200051269. The next prime is 81200051311. The reversal of 81200051286 is 68215000218.

It is a congruent number.

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, 1849095 + ... + 1892498.

It is an arithmetic number, because the mean of its divisors is an integer number (10152815319).

Almost surely, 2^81200051286 is an apocalyptic number.

81200051286 is an abundant number, since it is smaller than the sum of its proper divisors (81244993818).

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

81200051286 is a wasteful number, since it uses less digits than its factorization.

81200051286 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3745215.

The product of its (nonzero) digits is 7680, while the sum is 33.

The spelling of 81200051286 in words is "eighty-one billion, two hundred million, fifty-one thousand, two hundred eighty-six".