81299052826 has 16 divisors (see below), whose sum is σ = 125326895904. Its totient is φ = 39524866704.

The previous prime is 81299052803. The next prime is 81299052841. The reversal of 81299052826 is 62825099218.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 247980 + ... + 473383.

It is an arithmetic number, because the mean of its divisors is an integer number (7832930994).

Almost surely, 2^81299052826 is an apocalyptic number.

81299052826 is a deficient number, since it is larger than the sum of its proper divisors (44027843078).

81299052826 is a wasteful number, since it uses less digits than its factorization.

81299052826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 722925.

The product of its (nonzero) digits is 1244160, while the sum is 52.

The spelling of 81299052826 in words is "eighty-one billion, two hundred ninety-nine million, fifty-two thousand, eight hundred twenty-six".