81280527879 has 4 divisors (see below), whose sum is σ = 108374037176. Its totient is φ = 54187018584.

The previous prime is 81280527877. The next prime is 81280527883. The reversal of 81280527879 is 97872508218.

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

It is not a de Polignac number, because 81280527879 - 2¹ = 81280527877 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 (81280527871) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 13546754644 + ... + 13546754649.

It is an arithmetic number, because the mean of its divisors is an integer number (27093509294).

Almost surely, 2^81280527879 is an apocalyptic number.

81280527879 is a deficient number, since it is larger than the sum of its proper divisors (27093509297).

81280527879 is a wasteful number, since it uses less digits than its factorization.

81280527879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27093509296.

The product of its (nonzero) digits is 4515840, while the sum is 57.

The spelling of 81280527879 in words is "eighty-one billion, two hundred eighty million, five hundred twenty-seven thousand, eight hundred seventy-nine".