81553335126 has 16 divisors (see below), whose sum is σ = 168368176128. Its totient is φ = 26307527400.

The previous prime is 81553335113. The next prime is 81553335131. The reversal of 81553335126 is 62153335518.

It is a happy number.

It is a Curzon number.

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, 219229210 + ... + 219229581.

It is an arithmetic number, because the mean of its divisors is an integer number (10523011008).

Almost surely, 2^81553335126 is an apocalyptic number.

81553335126 is an abundant number, since it is smaller than the sum of its proper divisors (86814841002).

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

81553335126 is a wasteful number, since it uses less digits than its factorization.

81553335126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438458827.

The product of its digits is 324000, while the sum is 42.

The spelling of 81553335126 in words is "eighty-one billion, five hundred fifty-three million, three hundred thirty-five thousand, one hundred twenty-six".