81200854279 has 4 divisors (see below), whose sum is σ = 81205557984. Its totient is φ = 81196150576.

The previous prime is 81200854277. The next prime is 81200854289. The reversal of 81200854279 is 97245800218.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81200854279 - 2¹ = 81200854277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81200854277) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2325862 + ... + 2360515.

It is an arithmetic number, because the mean of its divisors is an integer number (20301389496).

Almost surely, 2^81200854279 is an apocalyptic number.

81200854279 is a deficient number, since it is larger than the sum of its proper divisors (4703705).

81200854279 is a wasteful number, since it uses less digits than its factorization.

81200854279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4703704.

The product of its (nonzero) digits is 322560, while the sum is 46.

The spelling of 81200854279 in words is "eighty-one billion, two hundred million, eight hundred fifty-four thousand, two hundred seventy-nine".